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      Question

      A train crosses a 300-metre-long bridge in 20 seconds,

      and the same train crosses a tunnel twice the length of the bridge in 35 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

      Solution

      Let the length and speed of train be тАШlтАЩ metres and тАШxтАЩ m/s, respectively.
      Then, according to question,
      (l + 300)/20 = (l + 600)/35
      7l + 2100 = 4l + 2400
      3l = 300
      l = 100 metres
      x = (l + 300)/20 = 400/20 = 20 m/s = 20├Ч(18/5) = 72 km/h

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