Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the faster train is:

30 km/hr
45 km/hr
60 km/hr
75 km/hr

Correct Answer: 60 km/hr

Explanation:

Let the speed of the slower train be x m/sec.

Then, speed of the faster train = 2x m/sec.

Relative speed = (x + 2x) m/sec = 3x m/sec.

∴	(100 + 100)	= 3x
	8

⟹ 24x = 200

⟹ x =	25	.
	3

So, speed of the faster train =	50	m/sec
	3

=	❨	50	x	18	❩km/hr
		3		5

= 60 km/hr.

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