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      Question

      A train of 250 metres is moving at a speed of 90 km/h.

      It completely crosses a platform in 45 seconds. What is the platform’s length?
      A 480 m Correct Answer Incorrect Answer
      B 665 m Correct Answer Incorrect Answer
      C 775 m Correct Answer Incorrect Answer
      D 875 m Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the length of the platform be ‘x’ metres

      Speed of the train = 90 × (5/18) = 25 m/s

      ATQ,

      (x + 250) = 25 × 45

      Or, (x + 250) = 1125

      Or, x = 1125 - 250

      Or, x = 875

      Therefore, the length of the platform = 875 metres

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