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Puzzle: 4 people walk across a bridge with one lamp to share. At a time only two people can go over it. Time taken to cross the bridge by these four people: 1,2,5,10 mins. IF TWO PEOPLE WITH SPEEDS 2 AND 10 cross the bridge then the total time taken is 10 mins, i.e. of the slowest person. Calculate the shortest time taken to cross the bridge.
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Associate Software Engineer

Interviewed at HCLTech

3.5★
Feb 29, 2012

Puzzle: 4 people walk across a bridge with one lamp to share. At a time only two people can go over it. Time taken to cross the bridge by these four people: 1,2,5,10 mins. IF TWO PEOPLE WITH SPEEDS 2 AND 10 cross the bridge then the total time taken is 10 mins, i.e. of the slowest person. Calculate the shortest time taken to cross the bridge.

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