A train 250m long passes a man, running at10 km/hr in the same direction in which the train is going, in 20 seconds. The speed of the train is: Choose the correct answer
A) 100  B) 60  C) 55  D) 50  E) 45
Speed of the train relative to man =250/20 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 -10) km/hr.   x - 10= 45 =55 km/hr.   Answer:55
<result>C</result>
A train 250m long passes a man, running at10 km/hr in the same direction in which the train is going, in 20 seconds. The speed of the train is: