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.

12 sec
24 sec
48 sec
60 sec

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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