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Discussion

  1. A train takes 24 sec to cross a 480 m platform and 36 sec to cover a 900 m platform. what is the length of the train?
    1. 360 m
    2. 400 m
    3. 390 m
    4. 430 m
  1. Correct Option: A

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

    Then, (x + 480 m) / 24 sec = y ....(i)
    and , (x + 720 m) / 36 sec = y ....(ii)

    From Eqs (i) and (ii)
    (x + 480) / 24 = (x + 900) / 36
    ⇒ 3x + 1440 = 2x + 1800
    ∴ Length of train, x= 360m


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