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Discussion

  1. A train crosses a pole in 10 sec and a 200m long platform in 20 sec. What is the length of the train?
    1. 100m
    2. 200m
    3. 250m
    4. 300m
  1. Correct Option: B

    Let the length of train be x meter and speed be y m/sec

    Therefore, time taken to cross the pole = x/y sec

    and time taken to cross the platform = ( Length of train + Length of platform) / speed of train

    Therefore x/y = 10
    And, (x+200) / y = 20
    ⇒ 10y + 200 = 20 y
    ∴ speed of train, y = 20 m/sec
    And length of rain = x = 10y = 200m



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