A train 135 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?  Options:	A) 13 km/hr	B) 53.6 km/hr	C) 17 km/hr	D) 18 km/hr	E) 12 km/hr
Speed of the train relative to man = (125/10) m/sec   = (13.5) m/sec. [(13.5) * (18/5)] km/hr   = 48.6 km/hr. Let the speed of the train be x km/hr. Then, relative speed   = (x - 5) km/hr. x - 5 = 48.6 ==&gt; x   = 53.6 km/hr.   Answer:53.6 km/hr
<result>B</result>
A train 135 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?