Latest self Aptitude Question SOLUTION: A bridge will collapse in 17 minutes. 4 people want to cross it before it collapses. It is a dark night and there is only one torch between them. Only two people can cross at a ti

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(#M40001953) SELF question crossing bridge Keep an EYE

A bridge will collapse in 17 minutes. 4 people want to cross it before it collapses. It is a dark night and there is only one torch between them. Only two people can cross at a time. "A" takes 1 minute to cross, "B" takes 2 minutes, "C" takes 5 and "D" takes 10 minutes. How do they all cross before the bridge collapses?

sumit (13 years ago)

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Sulekha  (13 years ago)

"A" takes 1 minute to cross, "B" takes 2 minutes, "C" takes 5 and "D" takes 10 minutes.

A+B.... 2 mins... A stays there.
B comes back in 1 min..... total 3 mins
c+D ...take 10 mins... Stay there....... 13 mins.
B comes back in 2 mins. ..total 15 mins.

A+B cross in 2 mins.. Total 17 mins.

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