(A) 2 Sec
(B) 3 Sec
(C) 5 Sec
(D) 6 Sec
Correct Option is: D
We know as the train and the running person are moving in opposite direction,therir speed values are added
to find the relative speed.
Relative speed = speed of mail train + speed of running engine
= (120 +12)km/hr
= 132 km/hr
Convert km/hr into m/s
132 km/hr = (132 * 5 /18) m/s
= (660 / 18)m/s
= 36.66 m/s
Time taken by train to pass a man = distance / speed
[ from the length of the mail train is the distance]
= 220 / 36.66
= 6 sec.