How many seconds will a 800 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 most appropriate option
A) 25  B) 30  C) 40  D) 48  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=800*3/50= 
<gadget id="calculator">800*3/50</gadget>
<output>48</output>
48sec   ANSWER:48
<result>D</result>
How many seconds will a 800 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?