(A) 9.97 Second
(B) 10.62 Second
(C) 13.20 Second
(D) 14.95 Second
Correct Option is: B
speed of the train = 35.5 km/hr
speed of the person = 5 km/hr
As the train and the running person move in same direction, their speed values are subtracted to find the
relative speed.
Relative speed (Speed of train relative to man) = (35.5-5)kmph = 30.5 kmph
Convert km/hr into m/s, 30.5 kmph = (30.5*5/18) m/s
= 8.47 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
90 m at a relative of 8.47 m/s
= 90/8.47
=10.62 sec
Hence, the time taken by the train to cross the running person is 10.62 sec