A train 700 m long passes a man, running at 20 km/hr in the same direction in which the train is going, in 40 sec. The speed of the train is?  Choose the correct choice from the following options:
A) 40 km/hr
B) 41 km/hr
C) 42 km/hr
D) 43 km/hr
E) 44 km/hr
Speed of the train relative to man = 700/40 = 35/2 m/sec.   = 35/2 * 18/5= 
<gadget id="calculator">35/2 * 18/5</gadget>
<output>63</output>
63 km/hr   Let the speed of the train be x km/hr. Then, relative speed= (x - 20) km/hr.   x - 20 = 63 =&gt; x = 43 km/hr.   Answer: 43 km/hr
<result>D</result>
A train 700 m long passes a man, running at 20 km/hr in the same direction in which the train is going, in 40 sec. The speed of the train is?