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Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.

A. 12 sec

B. 24 sec

C. 48 sec

D. 60 sec

Correct Answer : B.


Relative speed = (45 + 30) km/hr= 75 x 518  m/sec = 1256 m/sec.  We have to find the time taken by the slower train to pass the DRIVER of the faster train and not the complete train.  So, distance covered = Length of the slower train.  Therefore, Distance covered = 500 m.  Therefore Required time = 500 x 6125 = 24 sec.

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