1.

A train 125 m long passes a man, running at 5km/hr in the same direction in which the train is going,in 10 seconds. The speed of the train is:A) 45km/hrB)50 km/hrC)54 km/hrD)55 km/hr

Answer»

SPEED of the train relative to man :

= (125/10) m/sec

= (25/2) m/sec.

Speed:

=[(25/2) X (18/5)] km/hr

= 45 km/hr.

Let the speed of the train be 'S' km/hr.

Then, relative speed :

= (S - 5) km/hr.

S - 5 = 45

S = 50 km/hr.

Therefore The answer Is OPTION B



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