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Prateek Asked :

11-01-2022 Problems on Trains

Q. Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

A. 9
B. 9.6
C. 10
D. 10.8

Commented on 2022-01-29
Answer: Option D



Relative speed = (60 + 40) km/hr = (100 x   5/18) m/sec = 250/9 m/sec.

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time =  (300 x 9/250) sec = 54/5 sec = 10.8 sec.

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