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"U2" has a concert that starts in 17 minutes and they must all cross a...

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"U2" has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1or 2 people, must have the flashlight with them. The flashlight must be walked back and forth; it cannot be thrown. Each band member walks at a different speed. A pair must walk together at the rate of the slower man's pace: Bono: 1 minute to cross Edge: 2 minutes to cross Adam: 5 minutes to cross Larry: 10 minutes to cross For example: if Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission.

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