Then he asked me a brain teaser puzzle. There is a broken bridge and the night is dark. 4 persons have to cross the bridge and they have a single torch. Only 2 persons can cross the bridge at a time. They can cross the bridge in 1 min, 2 min, 7 min and 10 min. What is the min time in which all 4 can cross the bridge?

Question

Accepted Answer

First person and second person reach in 2 mints=2 minutes. First will back in 1minute = 1mint. 3rd and 1st in 7 mints = 7 mint 1st will back in 1mint = 1 mint . 4th and 1st in 10 mint = 10 mint total =21 minutes

Accepted Answer

((2 minutes was given to think for the solution and then I was told to explain the solution. Interviewer told me cross check the solution once again. He did tell whether I was right or wrong.))

Then Interviewer asked me if I had any questions for him. The interview went for around 15-20 mins.

(Be prepared to ask a relevant question to the interviewer at end of the interview.)

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