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Bridge

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Jaswinder24 | 11:26 Mon 09th Apr 2007 | Quizzes & Puzzles
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Four people, A, B, C, and D, are on one side of a bridge, and they all want to cross the bridge. However, it's late at night, so you can't cross without a flashlight. They only have one flashlight. Also, the bridge is only strong enough to support the weight of two people at once. The four people all walk at different speeds: A takes 1 minute to cross the bridge, B takes 2 minutes, C takes 5 minutes, and D takes 10 minutes. When two people cross together, sharing the flashlight, they walk at the slower person's rate. The bridge is going to blow up in 17 minutes. Can they all cross the bridge in 17 minutes
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Yes! A and B cross (2 mins); B stays. A returns (1 min); C and D cross (10 mins); B returns (2 mins); A and B cross (2 mins). Total : 17 mins.

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