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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.

Correct Answer: 24 sec

Explanation:

Relative speed = = (45 + 30) km/hr
= 75 x 5 m/sec
18
= 125 m/sec.
6


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.



∴ Required time = 500 x 6 = 24 sec.
125
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