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Cross a falling bridge

Puzzle: There is a bridge which is just about to fall down.
There are 4 people who must cross this bridge but the time each takes to cross is different.

But the bridge is very shaky and cannot support more than 2 people on it.
Also, its dark and the bridge travellers must carry a torch.

What is the minimum time in which these 4 people can cross the bridge?

Solution: The following image shows that it's possible to achieve the bridge crossing in 17 minutes.

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Site Owner: Sachin Goyal