A 253 metres long train running at the speed of 60 km/h takes 42 seconds to cross a bridge. The length (in m) of the bridge is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 447
Speed of the train = 60 km/h × (5/18) = 50/3 m/s
Speed = (length of the train + length of the bridge)/time
⇒ 50/3 = (253 + x)/42
⇒ 700 - 253 = x
x = 447 m