(A) 2.6 Sec
(B) 3.6 Sec
(C) 7.6 Sec
(D) 8.6 Sec
Correct Option is: C
Speed of the train = 136 km/hr
Speed of boy = 6 km/hr
Speed of the train relative to boy = (13 + 6)km/hr
= 142 km/hr
Convert km/hr into m/s 142 km /hr = (142 * 5 / 18)
= 710 / 18 m/s
= 39.44 m/s
Time taken by the train to cross a boy = time taken bt it to cover 300 m at 39.44 m/s
=300 / 39.44 [speed time= distance / speed]
= 7.6 sec