How many seconds will a 900 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 choice.
A) 25
B) 30
C) 40
D) 45
E) 54
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=900*3/50= 
<gadget id="calculator">900*3/50</gadget>
<output>54</output>
54sec   ANSW54R:54
<result>E</result>
How many seconds will a 900 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?