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      Question

      A train that is 210.5 metres long is moving at a speed of

      60 km/h. It crosses a platform in 42 seconds. What is the length of the platform?
      A 489.5 m Correct Answer Incorrect Answer
      B 525.5 m Correct Answer Incorrect Answer
      C 665.7 m Correct Answer Incorrect Answer
      D 335.3 m Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the length of the platform be ‘x’ metres

      Speed of the train = 60 × (5/18) = 16.67 m/s

      ATQ,

      (x + 210.5) = 16.67 × 42

      Or, (x + 210.5) = 700

      Or, x = 700 - 210.5

      Or, x = 489.5

      Therefore, the length of the platform = 489.5 metres

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