The Chennai Express of 200 m runs at a speed of 62 km/hr and a person runs on the platform at a speed of 20 km/hr in the direction opposite to that of train. Find the time taken by the train to cross the running person?
Options: A) 8.77 sec B) 9.77 sec C) 12.77 sec D) 13.00 sec E) None of these
EXPLANATION:   Given: Length of train = 200 m, speed of train = 62 km/hr, speed of person = 20 km/hr   1) Convert km/hr into m/s   - 62 km/hr = 62 x	5/18= 17.22 m/s   - 20 km/hr = 20 x	5/18=5.55 m/s   As the train and the running person move in opposite directions, their speed values are added to find the relative speed.   Relative speed (Speed of train relative to man) = 17.22 + 5.55= 
<gadget id="calculator">17.22 + 5.55</gadget>
<output>22.77</output>
22.77 m/s   We know,   Speed=	Distance/Time   Therefore, time taken by the train to cross the running person = Time taken by the train to cover 200 m at a relative of 22.77 m/s   =	200/22.78   = 8.77 sec   8.77 secNSWER IS 8.77 sec
<result>A</result>
The Chennai Express of 200 m runs at a speed of 62 km/hr and a person runs on the platform at a speed of 20 km/hr in the direction opposite to that of train. Find the time taken by the train to cross the running person?