A train running at a speed of 81 km/h passes 375 m long tunnel in 40 seconds. What is the length of the train (in m ) ?
Answer & explanation
Correct answer: option 2
Let the length of the train be ‘x’ m
Length of platform = (x + 375) m
Speed of train = 81 km/hr. = 81 × 5/18 = 22.5 m/sec.
∵ Time taken to cross the platform = (Sum of lengths of train & platform)/speed of train
⇒ 40 = (x + 375)/22.5
⇒ 900 = x + 375
⇒ x = 525m