A train 200 m long travels at 72 km/h. How many seconds does it take to pass a lamp post?
Correct answer: A. 10 seconds
72 km/h = 20 m/s. To pass a post, the train must travel its own length: 200 ÷ 20 = 10 seconds. To pass a platform or bridge, the train would have to cover its own length plus the length of the platform.
hard