How many seconds will a 150 m long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?  Choose the correct option.
A) 12 sec  B) 30 sec  C) 86 sec  D) 15 sec  E) 18 sec
Speed of train relative to man = 63 - 3= 
<gadget id="calculator">63 - 3</gadget>
<output>60</output>
60 km/hr.= 60 * 5/18 = 50/3 m/sec.   Time taken to pass the man = 150 * 3/50   = 15 sec.   Answer: 15 sec
<result>D</result>
How many seconds will a 150 m long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?