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      Question

      Train A running with a sped of 90 km/h crosses a

      vertical pole in 10 seconds. Speed of train A is 5 m/s less than speed of train B, and length of train B is 20 metres less than length of train A. Find the time taken by train B to cross a 100 metre long tunnel.
      A 10 seconds Correct Answer Incorrect Answer
      B 12 seconds Correct Answer Incorrect Answer
      C 15 seconds Correct Answer Incorrect Answer
      D 11 seconds Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of train A = 90 × 5/18 = 25 m/s Speed of train B = 30 m/s Length of train A = 10 × 25 = 250 metres Length of train B = 250 – 20 = 230 metres Desired time = (230 + 100)/30 = 11 seconds

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