Train A crosses a pole in 25 s and train B crosses the pole in 1 min 15 s . Length of train A is half the length of train B. What is the ratio between the speeds of A and B, respectively?
Correct Answer: 3 : 2
Explanation:
Let the lengths of the trains A and B be a and 2a, respectively.
when a train crosses a pole, it covers the distance equal to its length.
∴ Required ratio of speeds = a / 25 : 2a /75 = 3 : 2
