A train 125 m long passes a man, running at 9 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:	Choose the correct option:
A) 35 km/hr  B) 50 km/hr  C) 54 km/hr  D) 65 km/hr  E) 87 km/hr
Speed of the train relative to man   = (125/10) m/sec = (25/2) m/sec. [(25/2) * (18/5)] km/hr   = 45 km/hr. Let the speed of the train be x km/hr. Then, relative speed   = (x - 9) km/hr. x - 9 = 45 ==&gt; x = 54 km/hr.   Answer: 54 km/hr
<result>C</result>
A train 125 m long passes a man, running at 9 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: