There are four people. An old professor, his wife and two young students, Alice and Bob.

Professor takes 8 minutes to cross the bridge. wife takes 5 minutes to cross the bridge. Alice takes two minutes and Bob takes one minute to cross the bridge.

They have 15 minutes in total.

At a time maximum, two people can cross the bridge. There should be torch available with the people while crossing the bridge.

How will they reach in 15 minutes?

The bridge crossing puzzle - in English

4 people A,B,C,D wants to cross a bridge in 15 minutes. A takes 8 mins, B takes 5 minutes , C takes 2 minutes and D takes 1 minute. They need a torch to cross the bridge as it's getting dark. There is only a single torch with them. Also the bridge can hold a maximum of 2 people at a time. How to cross the bridge?

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