How many seconds will a 400 metre 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) 24 B) 30 C) 40 D) 45 E) 50
Relative speed of the train=63-3= 
<gadget id="calculator">63-3</gadget>
<output>60</output>
60kmph=60*5/18=50/3 m/sec   t=400*3/50= 
<gadget id="calculator">400*3/50</gadget>
<output>24</output>
24sec   24NSWER:24
<result>A</result>
How many seconds will a 400 metre 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?