A train 150 m long is running with a speed of 68 kmph In what time will it pass a boy who is running...........

Quantitative Aptitude (CDS) Problems on trains

A train 150 m long is running with a speed of 68 kmph. In what time will it pass a boy who is running at 8 kmph in the same direction in which the train is going?

5sec

9sec

13sec

10sec

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Explanation:

Speed of train relative to boy = 68-8 = 60 kmph
= 60×5/18 m/sec = 50/3 m/sec
Time taken by the train to cross the boy
= Time taken by it to cover 150 m at 50/3 m/sec
= 150×3/50se
= 9sec