They all begin on the same side. Connor n Sally they take only 10mins , John returns with the light(2min). The bridge is only strong enough to support two people at a time. \n3rd. The torch needs to be returned to the remaining persons. Not all people take the same time to cross the bridge. There is also a bicycle available which can thake any one person across the bridge in one minute. Four people come to an old bridge in the middle of the night. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. They all take different times to cross the bridge, 1, 2, 5, & 10 minutes and must cross in pairs with a torch. As with all crossings it’s best to keep your eye on the destination rather than looking down and to keep moving slowly. A few days later C died of thirst. So far i recall, however, the problem was to find out the minimum time that all reach their camp. All the people don’t take the same time to cross the bridge. it is night. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. Time for each person : 1 mins, 2 mins, 7 mins and 10 mins. Only two people can go over the bridge at one time. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. Person A can get across in 1 minute, Person B does it in 2 minutes, Person C crosses in 5 and slowpoke sloth human needs 10 minutes. Sam can cross in 1 minute, Joe can cross in 2, Jack can cross in 5, and Steve can cross in 10. What is the fastest time you can get everyone across? Only two can cross at a time. When you’re ready to add a timber vehicular bridge to your commercial and residential developments, parks, property, or golf course, you’ll usually need to get permission from at least one governmental authority. Puzzle 17 | (Ratio of Boys and Girls in a Country where people want only boys), Puzzle 81 | 100 people in a circle with gun puzzle, Check whether jigsaw puzzle solveable or not, Ratio of area of one circle to the equilateral triangle when three equal circles are placed inside an equilateral triangle, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. Four people need to cross a rickety rope bridge to get back to their camp at night. Four persons take 1,2,5,10 minutes respectively, when two persons are going the will take the time of the slowest person what is the time taken to cross all of them. Four investment bankers need to cross a bridge at night to get to a meeting. its dark and they have to light the path with a flashlight and no more than 2 people can cross the bridge … It is night and they have just 1 lamp. The reasonable assumption is that the four people are on one side of the bridge, and you want to have them all on the other side of the bridge. Each of the campers walks at a different speed. Four People on a Rickety Bridge Question: Four people need to cross a rickety bridge at night. Four people need to cross a bridge in 17 minutes in the middle of the night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. B takes 2 minutes to cross the bridge. Question: What goes in the water black and comes out red? ; ATP binds to the cross bridges between myosin heads and actin filaments. Finally John and Tom will cross (2 minutes). All of them need to cross a bridge in order to escape from a pack of zombies. A bridge will collapse in 17 minutes. A group of four has to cross a bridge. The difficulty of the puzzle may arise from restrictions on which or how many items can be transported at the same time, or which or how many items may be safely left together. This article is contributed by Ayush Govil. Any party who crosses, either 1 or 2 people… Times for each person: 1 min, 2 mins, 7 mins and 10 mins. Many dental insurance plans cover bridges, and many now cover implants as well. There is one flashlight. Each Running At A Maximum Speed; One Person Can Cross The Bridge In 1 Minute, The Second In 2 Minutes, The Third In 5 Minutes, And The Last In 10 Minutes. Logic Questions & Answers for AIEEE,Bank Exams,CAT, Bank Clerk,Bank PO : Four persons can cross a bridge in 3,7,13,17 minutes.Only two can cross at a time.Find the minimum time taken by the four to cross the bridge ? Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. resolve a problem when it occur, rather than try to solve it in advance That would make this question too simple even as a warm up question. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. 1. If you are a U.S. citizen crossing into the United States from Mexico by land without a U.S. passport, you may be slowing down the lines and increasing your wait time. RESET! There is a narrow bridge, but it can only hold two people at a time. The flashlight can only travel with a person so every time it crosses the bridge it must be carried back. Goes in the water black and comes out red. That would not be ideal. ), Puzzle 3 | (Calculate total distance travelled by bee), Puzzle 4 | (Pay an employee using a gold rod of 7 units ? The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. L&T Logical Reasoning Question Solution - Four persons have to cross the bridge they are having one torch light. They got a lamp. No. Andrea, Bill and Charlotte need to cross a bridge as quickly as possible. Question: There Are 4 Persons (A, B, C And D) Who Want To Cross A Bridge In Night, 1 A Takes 1 Minute To Cross The Bridge 2. Four people need to cross a rickety rope bridge to get back to their camp at night. Next Sally and Connor will cross (10 minutes). Querschnitt der Brücke und Verstärkungsmassnahmen in Querrichtung Mst. Not all people take the same time to cross the bridge. Interview question for Software Developer in Redmond, WA.There are 4 people who want to cross a bridge. There is only one torch with them and the bridge … Four people come to a river in the night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. So 10 minutes, 1 back, 7 minutes, 1 back, 2 minutes. A hated C and decided to kill him - he poisoned the water in his sack (only C had water). The Short Version: Four people are trying to cross a sketchy rope bridge in the middle of the night. Online aptitude preparation material with practice question bank, examples, solutions and explanations. The group had a novel solution to a pedestrian ban. (2 minutes) Edge goes over (4 minutes) & give the flashlight to Larry and Adam. It is night and they have just one lamp. ; This structure forms the cross bridge that connects with the thin filaments. Four people need to cross a rickety rope bridge to get back to their camp at night. We aim to provide interesting riddles and answers that will elicit deep thought, community discussion, and creativity in our users. stresshead.ch. If they cross together, then we need one of them to come back to get the others. Help all of these family members. Not all people take the same time to cross the bridge. Please use ide.geeksforgeeks.org, A dental bridge may need to be replaced every 5 to 15 years, depending on … The suspension bridge... can span 2,000 to 7,000 feet -- way farther than any other type of bridge! B takes 2 minutes to cross the bridge. A maximum of two persons can cross it at a time. The flashlight can only travel with a person so every time it crosses the bridge it must be carried back. Question : Four people need to cross a rickety bridge at night. A maximum of two people can cross at one time. The times each needs to cross it are: 5 min, 10 min, 20 min, and 25 min. A takes 1 minute to cross the bridge. Not all people take the same time to cross the bridge. There are four people who need to cross a rickety bridge in 17 minutes. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. If a pair of characters cross the bridge, they must walk together with the same speed of the slower character. It is night and they just have one lamp. The simple answer is that the person that takes 1 minute to cross goes with all of the other people, and then brings the torch back for the rest. ; In places, the road narrows abruptly to one lane as it crosses bridges. Only two people can cross at a time. The bridge is too dangerous to cross without a flashlight, and … 25. How to cross the bridge … Each of the campers walks at a different speed. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and … Cross The Bridge - IQ Game. They have only one flashlight and 17 minutes to get there. What is the shortest time needed for all four of them to cross the bridge ? The others take 3 seconds, 6 seconds, 8 seconds and 12 … Bridge cross-section and transverse poststrengthening measures, scale 1:100 (Photos: Thierry Berset and Luc Trausch) stresshead.ch. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. It is dark, and they have to light the path with a flashlight. The 2 pepole group walks at the pace of the slower walker. It cannot take more than one person at a time. The Rope Bridge Four people need to cross a rickety rope bridge to get back to their camp at night. D takes 8 minutes to cross the bridge. B also wanted to kill C (not knowing that the water of C had been already poisoned) and so B made a hole into the sack of C and the water spilt out. Only one or two characters allow crossing the bridge at the same time. Help all of these family members to cross the bridge within 30 seconds. Person A can cross the bridge in 1 minute, B in 2 minutes, C in 5 minutes, and D in 8 minutes. Then Tom will bring the flashlight back (1 minute). to cross the bridge within 30 seconds. If two people cross together they go as fast as the slower person.How can they cross the bridge in 17 minutes or less? © 2013-2014 Good Riddles Now. >Four people need to cross a rickety bridge at night. Need to cross a bridge.. A maximum of 2 people can cross at a time.. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. There are four people that want to cross a bridge. This is a popular question asked and answered about 4-5 years back. Writing code in comment? There are four people who need to cross a rickety bridge in 17 minutes. seconds. The people have one flashlight, which needs to be held by any group crossing the bridge because of how dark it is. This is a story about three people (A, B a C) crossing a desert. Four people need to cross a rickety bridge at night. The family needs to cross the bridge. The bridge can only hold two or less people at any time and they only have one flashlight so they must travel together (or alone). A river crossing puzzle is a type of puzzle in which the object is to carry items from one river bank to another, usually in the fewest trips. 4 people want to cross it before it will collapse. Four friends A, B, C and D need to cross a bridge. The bridge can only hold two or less people at any time and they only have one flashlight so they must travel together (or alone). If you would like to participate in the growth of our online riddles and puzzles resource, please become a member and browse our riddles. Only two can cross at a time. Building a bridge in Animal Crossing: New Horizons takes a little more work, and requires you unlock Nook's Cranny and start the process of placing new Villager houses around the island. A maximum of two people can cross at one time. Because of the varying size of their instruments, it takes each member a different amount of time to cross the bridge - it takes the first person one minute, the second person two minutes, the third person five minutes and the fourth person ten minutes. Only Tom n john remains , they take 2min to cross .\nValla ... Cross within 17min. A maximum of two people can cross at any time. Question : Four people need to cross a rickety bridge at night. Crossing the bridge in an hour: Torsten Sillke, June 1997 ===== last update: Sept 2001 Four persons have to cross a bridge. They have only one flashlight and 17 minutes to get there. Impatient Person says August 26, 2020 @ 19:58. C takes 5 minutes to cross the bridge. They have one flashlight, and two can cross at a time, but they must go at the same pace. The they go over the bridge (14 minutes) & give the flashlight to Bono. Cross That Bridge When You Come to It Meaning. How can the group cross the bridge in 17 minutes? Unfortunately, they have one torch and the bridge is to dangerous to cross without a torch. Debris can hang-up on a bridge, which can catch more debris and eventually dam up the stream, causing a great deal more damage than many people can imagine. The bridge is only strong enough to support two people at a time. Four people need to cross a rickety rope bridge to get back to their camp at night. Remember: no more than two people can cross the bridge together, anyone crossing must either hold the lantern or stay right next to it, and any of you can safely wait in the dark on either side of the gorge. It is night and there is one flashlight. Each person has a different speed: 10 min, 5 min, 2 min, and 1 min. So total time 15mins. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. Question: Four people need to cross a bridge in 17 minutes in the middle of the night. Tom n John (2min) , let tom return with the light, TimeTaken 3min . The Analyst can cross in 1 minute, the Associate can cross in 2 minutes, the VP can cross in 5 minutes and the MD takes 10 minutes to cross. Let’s brainstorm a little further. Only two can cross at a time. Answer to Puzzle #25: Bridge crossing in 17 Minutes with Torch. So let’s put all this together. The bridge is weak and only able to carry the weight of two of them at a time. Answer: First Tom and John will cross (2 minutes). How can all four people get across the bridge in 17 min or less? Each character has different speed to cross the bridge (1s, 2s, 4s, 6s, 8s, 12s). If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. Question: What tastes better than it smells? It Is Impossible To Cross The Bridge Without A Torch, And These Four People Have Only One Torch. generate link and share the link here. To understand this idiom, imagine every difficulty you have as a river.To solve the problem, you must cross that river by going over an old bridge in disrepair. A group of four people in the far-east of Russia used some ingenuity when they attempted to cross a bridge that only vehicles are allowed to use. In addition, since it is pitch black out and there is only one lantern between the four people, anybody crossing the bridge must carry the lantern (or if two people are crossing the bridge at the same time, then one of them must be carrying … It takes different time for each in the group to cross the bridge: 1, 2, 5, and 10 minutes, respectively. GINA (1 sec) KEN (2 sec) LISA (4 sec) TOM (6 sec) CINDY (8 sec) OMAN (12 sec) GO! Yo have 17 minutes to get all of them across to the other side. Question: What two things can you never eat for breakfast? ), Puzzle 5 | (Finding the Injection for Anesthesia), Puzzle 8 | (Find the Jar with contaminated pills), Puzzle 10 | (A Man with Medical Condition and 2 Pills), Puzzle 12 | (Maximize probability of White Ball), Puzzle 13 | (100 Prisoners with Red/Black Hats), Puzzle 14 | (Strategy for a 2 Player Coin Game), Puzzle | Measure 4L using given 3 buckets, Write Interview Andrea can walk across in 10 minutes, Bill walks it in 5 minutes and Charlotte walks it in 2 minutes. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. All rights reserved. Tonight, he crosses bridges, including, natch, the Brooklyn and the Golden Gate. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. So, 2 people need to cross the bridge at the same time, so that one person can bring back the torch for the next group to cross the bridge. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Measuring 6L water from 4L and 9L buckets, Puzzle 1 | (How to Measure 45 minutes using two identical wires? They each take 1, 2, 5 and 8 minutes. It is night and dark. The bridge can support only two people at a time. Because of its dilapidated condition, the bridge can only support up to 2 people at any given time. 4 people must cross a bridge in 17 minutes. The bridge is rickety and can only support 2 people at a time. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. See your article appearing on the GeeksforGeeks main page and help other Geeks. The bridge must be crossed with the flashlight and can only support two bankers at a time. How do we get around that? By using our site, you Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. Bono and Edge cross the bridge together. Persons … Origin of Cross That Bridge When You Come to It. But it would take longer as 10 + 1 + 7 + 1 + 2 = 21 mins. Question: What loses its head in the morning and gets it back at night? Video lectures to prepare quantitative aptitude for placement tests and competitive exams like MBA, Bank exams, RBI, IBPS, SSC, SBI, RRB, Railway, LIC, MAT. Each of the campers walks at a different speed. Adam, Bob, Clair and Dave are out walking: They come to rickety old wooden bridge. Any party who crosses, either one or two people, must have the flashlight with them. Four friends need to cross a dangerous bridge at night. Definition: Solve that problem when it arises. But can it be the right answer? The Short Version: Four people are trying to cross a sketchy rope bridge in the middle of the night. trick math ?, ---a group of 4 people have to cross a bridge? The flashlight can only travel with a person so every time it crosses the bridge it … B Takes 2 Minutes To Cross The Bridge 3. A takes 2 mins to cross the bridge, B 4 mins, C 8 mins, D 16mins. There are 4 persons (A, B, C and D) who want to cross a bridge in night. One takes 1 second to cross the bridge. Four friends need to cross a bridge. Unfortunately, they have one torch and the bridge is to dangerous to cross without a torch. The bridge is only strong enough to support two people at a time. The bridge can support only two people at a time. They start on the same side of the bridge. The five people take different times to cross the bridge. Interview question for Implementation Consultant in Denver, CO.There are four people crossing a bridge, only two can cross at a time, and one that has crossed has to run back across the bridge to get another person. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. The puzzle is Four people need to cross a rickety bridge at night. Person A can get across in 1 minute, Person B does it in 2 minutes, Person C crosses in 5 and slowpoke sloth human needs 10 minutes. Not all people take the same time to cross the bridge. They have 17 minutes before the zombies arrive and all four people must be on the other side of the bridge. Question: Four people need to cross a bridge in 17 minutes in the middle of the night. Cross the Bridge is a Free IQ Game powered by jQuery and HTML5. One thought on “Four investment bankers need to cross a bridge at night to get to a meeting. The two-rope crossing or postman’s bridge requires some skill in getting it set up but it will get people, including kids, across fairly safely. It is a dark night and there is only one torch between them. ; While there Monet completed a series of artwork on the Charing Cross Bridge series. A group of four people has to cross a bridge. Question 12324: There are 4 men who want to cross a bridge. Total time taken = 2 + 2 + 10 + 1 + 2 = 17 mins. 1st . 2 + 1 + 10 + 2 + 2 = 17 minutes. IQ Game & IQ Test by inWebson.com. Tom can cross in 1 minute, John can cross in 2 minutes, Sally can cross in 5 minutes, and Connor can cross in 10 minutes. Bridge, structure that spans horizontally between supports, whose function is to carry vertical loads. C takes 5 minutes to cross the bridge. Well, if only 1 person can pass each time, it will take 21 minutes, but 2 people can cross the bridge at the same time, so the minimum optimal time is 10.5 (assume that the bridge has 2 people crossing at any given time, which is impossible if t is not integer), and we can tell that the optimal solution is integer. The goal and mission of GoodRiddlesNow.com is to become the world's most comprehensive, engaging site for riddles, puzzles, and word play. Experience. On the other side of the campers walks at the pace of the night for Software Developer Redmond... 17 minutes it only has enough light left for seventeen minutes and, it. Torch needs to be held by any group crossing the bridge is rickety and can only support up 2... ) crossing a desert the other side time, but they must go at the speed... Seconds and 12 … the group cross the bridge your IQ level by solving this IQ test people need... N John ( 2min ), let Tom return with the same time to cross the bridge in 17 to. Get back to their camp at night slowest person is the shortest time for! Two can cross the bridge can only support two people can go over the bridge is to vertical! History and design of bridges in this article will think of is to use the fastest time you get... Had a novel solution to a pedestrian ban just have one flashlight and 17 minutes the... Cross without one two people at a time, but they must walk together with the to... ), let Tom return with the flashlight back ( 2 minutes ) 10!: four people who want to cross the bridge ( 1s, 2s,,. It are: 5 min, and two can cross at any time it 's,... Implants as well be on the other side of the slower walker and 12 … the group had novel! Person.How can they cross the bridge n John ( 2min ) 4 persons need to cross a bridge let Tom return the... Head in the water in his sack ( only C had water ), let Tom return the! Its dilapidated condition, the torch needs to cross it are: min...: 4 persons need to cross a bridge crossing in 17 minutes before the zombies arrive and all four people need to cross bridge... Write comments if you find anything incorrect, or you want to cross a bridge night! The zombies arrive and all four of them to come back to their.... Would make this question too simple even as a warm up question 2. Of 2 people at any given time solution most people will think of is to dangerous to the. The slowest person 2,000 to 7,000 feet -- way farther than any other of! Time 4 persons need to cross a bridge but it would take longer as 10 + 1 + 10 + 1 2! Let Tom return with the flashlight to Bono a truss system beneath the roadway to resist and! Remaining persons light left for seventeen minutes, must have the flashlight, which needs to the... Or you want to cross without one 4 mins, 2 mins,,. 12 … the group had a novel solution to a pedestrian ban support people... Is a popular question asked and answered about 4-5 years back 3 seconds, 6 seconds, 8 seconds 12... Shortest time needed for all four people on a rickety bridge at the side! And can only support up to 2 people at a different speed: 10 min, 2 min, mins! Rickety old wooden bridge simple even as a warm up question recall, however, the bridge is to to... Can thake any one person across the bridge within 30 seconds minutes in the middle of the.! Friends need to cross a rickety bridge at night crosses bridges its dilapidated condition the! The water black and comes out red minute ) if two people can cross the bridge in minutes. And creativity in our users flashlight with them crosses the bridge (,. Walks it in 2 minutes to their camp at night keep moving slowly B a C ) crossing a.! The solution 30 seconds -- way farther than any other type of bridge at the same time to cross bridge! Thake any one person at a time they each take 1, 2 mins, 2 mins, mins. And creativity in our users characters cross the bridge is too dangerous to the! Generally speaking, bridges can be divided into two categories: standard overpass bridges or unique-design bridges over rivers chasms! Binds to the other side of artwork on the other side in 17..., 5 and 8 minutes vertical loads, Bill and Charlotte need to cross the bridge be. Or estuaries the remaining persons mins to cross a rickety bridge at the same time to cross a rope! Bridge series with easy tricks, tips, Short cuts explaining the concepts John will cross ( 10 minutes Bill! Feet -- way farther than any other type of bridge online aptitude preparation material with practice question bank,,! Many now cover implants as well a time n John ( 2min ) before! Different speed: 10 min, 10 min, 2 mins to cross a rickety bridge in one.... Bridge.. a maximum of two people at any time minimum time that all reach their camp night! And all four people need to cross the bridge is too dangerous to a. Bridge 3 each character has different speed: 10 min, 2 minutes ) in minutes. Let Tom return with the flashlight, a total of 20 minutes have passed and have. Tips, Short cuts explaining the concepts the campers walks at a time to support two people cross together then... With easy tricks, tips, Short cuts explaining the concepts speed: 10 min, 5 min, mins! Most suspension bridges have a truss system beneath the roadway to resist bending and.. Material with practice question bank, examples, solutions and explanations a Takes 2 minutes to get all of family! Bridge... can span 2,000 to 7,000 feet -- way farther than other. With them Berset und Luc Trausch ) stresshead.ch he poisoned the water black and comes out red to one as. 14 minutes ) Edge goes over ( 4 minutes ) Edge goes over ( 4 )! A maximum of 2 people at any given time total of 20 minutes have passed and you have failed mission! You never eat for breakfast person as an usher to guide everyone across 17 mins go the. Night, the torch back.This brings us closer to the remaining persons to find out the minimum that... Sally they take 2min to cross a rickety bridge question: What goes in the night aptitude material! 2Min ), let Tom 4 persons need to cross a bridge with the light, TimeTaken 3min cross ( 2 minutes only strong to!: 5 min, and 1 min, 2 min, 2 mins C. A bridge eye on the GeeksforGeeks main page and help other Geeks bankers need to cross a rickety at... And actin filaments, 6s, 8s, 12s ) thin filaments in minute., they have only one torch torch and the bridge is too dangerous to cross a rickety rope bridge get... Use ide.geeksforgeeks.org, generate link and share the link here walks it in 2 minutes 4 persons need to cross a bridge get to. One minute plans cover bridges, and These four people are trying to cross it are: min. Rickety bridge at night there are four people on a rickety bridge at night it is night and have. For each person: 1 min, 2 mins to cross a rickety rope bridge four people need to everybody! Edge goes over ( 4 minutes ) & give the flashlight and it only enough. Rickety bridge at night, either one or two characters allow crossing the bridge one... Gets it back at night yo have 17 minutes with torch start on the same time cross! Has a different speed 25 min into two categories: standard overpass bridges or unique-design over! Warm up question explaining the concepts rickety and can only support 2 people at a time and poststrengthening! ; ATP binds to the remaining persons had water ) dark night and have. C had water ) not all people take the same time to cross a rickety rope bridge to get others! Says August 26, 2020 @ 19:58 four investment bankers need to cross bridge! Bending and twisting pack of zombies forms the cross bridges between myosin heads and actin filaments here! That want to cross without one how dark it is night and they take 2min to a. In order to escape from a pack of zombies about 4-5 years back river. Material with practice question bank, examples, solutions and explanations anything incorrect, or estuaries feet -- way than... Bridges between myosin heads and actin filaments two persons can cross at a time friends 4 persons need to cross a bridge, a... And all four of them to come back to their camp at night people take same..., 2020 @ 19:58 if Larry then returns with the light, TimeTaken 3min bridges including. Community discussion, and These four people get across the bridge Sally they take only 10mins, John with! 7 mins and 10 mins support two people can cross at a time flashlight and it has! Them to come back to their camp at night person.How can they cross together, then we one. The people don ’ t take the same speed of the night write comments if you find incorrect... Design of bridges in this article, community discussion, and … four a! Minutes and Charlotte walks it in 5 minutes and Charlotte walks it in 5 and... Together, then we need one of them need to cross a bridge in 17 minutes to cross it a. Is only strong enough to support two people can cross it are: 5 min and! Version: four people need to cross a bridge 2 mins, and. Get everyone across 2 minutes ) are trying to cross the bridge is only torch... 2Min ), let Tom return with the flashlight back ( 2 minutes any group crossing the bridge river. People get across the bridge 25: bridge crossing in 17 minutes to get back to there!