Multiple choice

  1. How much time will the train A take to cross another train B running in opposite direction?I. Length of two trains together is 650mII. Ratio of the speed of trains A and B is 4:5III. Train B crosses a signal pole in 8sec.

  1. Only I and II are sufficient

  2. I, II and III are not sufficient

  3. Only II and III are sufficient

  4. Only I and III are sufficient

  5. None
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B Correct answer
AI explanation

To find the time for two trains to cross each other moving in opposite directions, we need the sum of their lengths and the sum of their speeds. Statement I gives the sum of the lengths as 650 m. Statement II gives the ratio of their speeds as 4:5. Statement III allows us to find the length of train B since it uses the signal pole, but we still lack the exact value of train A's length or the exact speeds of either train. Since we only have a ratio and no definitive speeds, all three statements together are not sufficient to solve the problem.

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