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      Question

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

      vertical pole in 12 seconds. Speed of train A is 5 m/s less than speed of train B, and length of train B is 88 metres less than length of train A. Find the time taken by train B to cross a 202 metre long tunnel.
      A 10.8 seconds Correct Answer Incorrect Answer
      B 11.8 seconds Correct Answer Incorrect Answer
      C 13.8 seconds Correct Answer Incorrect Answer
      D 12.8 seconds Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of train A = 90 Γ— 5/18 = 25 m/s Speed of train B = 30 m/s Length of train A = 12 Γ— 25 = 300 metres Length of train B = 300 – 88 = 212 metres Desired time = (212 + 202)/30 = 13.8 seconds

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