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Puzzles: Cross the bridge

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Cross the bridge

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Four people have to cross a narrow bridge at night. The bridge can only take a maximum of two people at a time and they must use a torch. They only have one torch.  Individually they can cross in 1, 2, 5 and 10 minutes. If two travel together they must go at the speed of the slowest. How do they all get across in 17 minutes?

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Content Type: Discussion
Created at 08/09/2010 04:04 PM by John Rowland
Last modified at 08/09/2010 04:05 PM by John Rowland