A train 500 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 choice from the following choices:  A) 45 km/hr  B) 50 km/hr  C) 54 km/hr  D) 55 km/hr  E) 185 km/hr
Speed of the train relative to man = (500/10) m/sec = 50 m/sec. [50 * (18/5)] km/hr = 180 km/hr. Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr. x - 5 = 180 ==&gt; x = 185 km/hr.   ANSW185 km/hrR: 185 km/hr
<result>E</result>
A train 500 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: