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      Question

      A train can cross a pole in 18 seconds. While if the

      train increased its speed by 75% then time taken by it to cross 444 metres long platform is 42 seconds. Find the time taken by the train to cross a 136 metre long tunnel.
      A 45 seconds Correct Answer Incorrect Answer
      B 43 seconds Correct Answer Incorrect Answer
      C 39 seconds Correct Answer Incorrect Answer
      D 34 seconds Correct Answer Incorrect Answer
      E 35 seconds Correct Answer Incorrect Answer

      Solution

      Let speed of train is тАШxтАЩ m/s So, length of train = 18 ├Ч x = 18x metres And, 18x + 444 = 1.75 ├Ч x ├Ч 42 Or, 55.5x = 444 Or, x = 8 m/s So, length of train = 18 ├Ч 8 = 144 metres Desired time = (144 + 136)/8 = 35 seconds

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