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59. A 400 m long train takes 36 sec. to cross aman walking at 20 km/hr in the direction oppositeto that of the train. What is the speed of the train'?(A) 20 km/hr(B) 30 km/hr(C) 15 k/hr(D) 11 km/hr

Answer»

Relative speed of train

400/36×18/5 =40 km/h

Relative Speed of train = Speed of train + Speed of man

=> 40 = Speed of train + 20

Therefore, Speed of train = 40 - 20 = 20 km/h

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