Problems on Trains | Aptitude Question and Answer

SBI-PO-main

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

 

Solution

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.

Answer: D

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