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      Question

      A train crosses a 250-metre-long platform in 18 seconds,

      and a tunnel 60% longer than the platform in 27 seconds. Find the speed of train in km/h.
      A 72 km/hr Correct Answer Incorrect Answer
      B 75 km/hr Correct Answer Incorrect Answer
      C 66 km/hr Correct Answer Incorrect Answer
      D 60 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the length and speed of train be тАШlтАЩ metres and тАШxтАЩ m/s, respectively.
      Then, according to question,
      (l + 250)/18 = (l + 400)/27
      3l + 750 = 2l + 800
      l = 50
      l = 50 metres
      x = (l + 250)/18 = 300/18 ├Ч(18/5) = 60 km/h

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