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:	Pick:	A) 45 km/hr	B) 55 km/hr	C) 35 km/hr	D) 50 km/hr	E) 56 km/hr
Speed of the train relative to man =125/10	m/sec   25/2	m/sec.   25/2	x 18/15	km/hr   = 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. Answer : 50 km/hr
<result>D</result>
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: