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: Choose the correct choice from the following options:
A) 45 km/hr  B) 50 km/hr  C) 54 km/hr  D) 55 km/hr  E) 57 km/hr
Speed of the train relative to man =125/10 m/sec   =25/2 m/sec.   =25	/2x18/5km/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>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: