How many seconds will a 500 metre long train moving with a speed of 63 km/hr, take to cross a man walking with a speed of 3 km/hr in the direction of the train ?	Choose the most appropriate option.
A) 30 B) 40 C) 50 D) 20 E) 15
Dist = 500 m   relative speed = (63-3)= 
<gadget id="calculator">(63-3)</gadget>
<output>60</output>
60 km/hr   60*5/18= 50/3 m/s   time taken = 500/(50/3)= 
<gadget id="calculator">500/(50/3)</gadget>
<output>30</output>
30 sec   30NSWER 30
<result>A</result>
How many seconds will a 500 metre long train moving with a speed of 63 km/hr, take to cross a man walking with a speed of 3 km/hr in the direction of the train ?