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A train 100 m long is running at the speed of 30 km / hr. Find the time taken  by   it to pass a man standing near the railway line.

A. 12 sec

B. 20 sec

C. 15 sec

D. 17 sec

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Correct Answer :

A. 12 sec


Speed of the train = (30 x 5/18_) m / sec = (25/3) m/ sec.


       Distance moved in passing the standing man = 100 m.


       Required time taken = 100/(25/3) = (100 *(3/25)) sec = 12 sec

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