A train 140 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 answer:
A) 13 km/hr	B) 55.4 km/hr	C) 17 km/hr	D) 18 km/hr	E) 12 km/hr
Speed of the train relative to man = (140/10) m/sec   = (14 m/sec. [(14   ) * (18/5)] km/hr   = 50.4 km/hr. Let the speed of the train be x km/hr. Then, relative speed   = (x - 5) km/hr. x - 5 = 50.4 ==&gt; x   = 55.4 km/hr.   Answer:55.4 km/hr
<result>B</result>
A train 140 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?