A train 225 m long passes a man, running at 10km/hr in the same direction in which the train is going, in10 seconds. The speed of the train is:
Pick:
A) 81	B) 90	C) 91	D) 85	E) 96
Speed of the train relative to man =225/10 m/sec   =45/2m/sec.   =45/2x18/5km/hr   = 81 km/hr.   Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.   x - 10 = 81 =91km/hr.   Answer:91
<result>C</result>
A train 225 m long passes a man, running at 10km/hr in the same direction in which the train is going, in10 seconds. The speed of the train is: