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?

3 : 2
3 : 4
4 : 3
Could't be determined

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

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