How many seconds will a 400 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 answer.
A) 20
B) 30
C) 40
D) 24
E) 60
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 = 400 * 3/50= 
<gadget id="calculator">400 * 3/50</gadget>
<output>24</output>
24 sec.   Answer: Option 24
<result>D</result>
How many seconds will a 400 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?