A train crosses a standing pole in 20 seconds and a platform of length 400 metre in 40 seconds. What is the speed (in m/s) of train?
Show answer & explanation
Correct answer: B
Explanation
Let the speed of the train = x m/s
Time taken to cross the pole = 20 seconds
Length of the train = 20x
Distance -
40x = 20x + 400
20x = 400
x = 20 m/s