(A) 30 Sec
(B) 36 Sec
(C) 43 Sec
(D) 75 Sec
Correct Option is: B
Speed of the train = 12.5 km/hr
Speed of girl = 1 km/hr
Relative speed = speed of train + speed of girl
= (12.5 + 1) km/hr
= 13.5 km/hr
Convert km/hr into m/s
13.5 km/hr = ( 13.5 * 5 /18)m/s
= 67.5 / 18 m/s
= 3.75 m/s
Time = distance / speed
Time taken by the train to pass the man = 135 / 3.75
= 36 sec.