A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:

45 km/hr
50 km/hr
54 km/hr
55 km/hr

Correct Answer: 50 km/hr

Explanation:

Speed of the train relative to man =	❨	125	❩m/sec
		10

=	❨	25	❩m/sec.
		2

=	❨	25	x	18	❩km/hr
		2		5

= 45 km/hr.

Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.

∴ x - 5 = 45 ⟹ x = 50 km/hr.

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