(A) 15 Sec
(B) 20 Sec
(C) 40 Sec
(D) 45 Sec
Correct Option is: C
Length of the train = 170 m
Length of the bridge = 80 m
Therefore, length of the train + length of the bridge = (170 + 80) m = 250m
Speed of the train = 22.5 km/hr
Speed of the train = 22.5 × 5/18 m/sec
= 112.5/18m/sec
= 6.25m/sec
Therefore, time taken by the train to cross the bridge = 250 m/6.25 m/sec. = 40 seconds