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:	Select
A) 45 km/hr B) 50 km/hr C) 54 km/hr D) 55 km/hr E) 60 km/hr
Explanation:   Speed of the train relative to man = 125/10	m/sec   = 25/2	m/sec   = 25/2	x	18/5	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 IS 50 km/hr
<result>B</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: