Multiple choice

Train A crosses a pole in 25s and tarin 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 the speed of A and B respectively ?

  1. 3 : 2

  2. 3 : 4

  3. 4 : 3

  4. 2 : 3

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A Correct answer
Explanation

Let length of A = L, so length of B = 2L. Speed of A = L/25. Speed of B = 2L/75 = L/37.5. Ratio A:B = (L/25):(L/37.5) = 37.5:25 = 3:2 after multiplying by 1.5. Or: (L/25) / (2L/75) = (L/25) × (75/2L) = 75/50 = 3/2.