Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:

50 m
72 m
80 m
82 m

Correct Answer: 50 m

Explanation:

Let the length of each train be x metres.

Then, distance covered = 2x metres.

Relative speed = (46 - 36) km/hr

=	❨	10 x	5	❩m/sec
			18

=	❨	25	❩m/sec
		9

∴	2x	=	25
	36		9

⟹ 2x = 100

⟹ x = 50.

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