A train running at 72 km/h crosses a pole in 12 seconds. How much time (in seconds) will it take to cross a bridge 360 m long?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 30.
Speed of the train in m/sec = 72 × 5/18 = 20 m/sec.
Length of the train = Speed × time = 20 × 12 = 240m
Time = Total distance/speed
Time taken by train to cross the bridge = (Length of train + length of platform)/speed
⇒ (240 + 360)/20 = 30 sec.