A train 500 m long passes a man, running at 9 km/hr in the same direction in which the train is going, in 20seconds. The speed of the train is: Choose the correct choice:
A) 105
B) 95
C) 90
D) 99
E) 100
Speed of the train relative to man =500/20 m/sec   =25m/sec.   =25x18/5km/hr   = 90 km/hr.   Let the speed of the train be x km/hr. Then, relative speed = (x - 9) km/hr.   x - 9= 90 =99 km/hr.   Answer:99
<result>D</result>
A train 500 m long passes a man, running at 9 km/hr in the same direction in which the train is going, in 20seconds. The speed of the train is: