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Home Aptitude Problems on Trains See What Others Are Saying!
  • Question
  • Find the length of a train if it takes 10 seconds to cross a pole and double of this time to cross a platform of length 200 mts ?


  • Options
  • A. 180 mts
  • B. 190 mts
  • C. 200 mts
  • D. 210 mts

  • Correct Answer
  • 200 mts 

    Explanation

    Let the length of the train be 'L' mts

    let the speed of the train be 'S' m/s

    Given it crosses a pole in 10 sec=> L/S = 10 ......(1)
    Given it takes 20 sec (double of pole) to cross a platform of length 200 mts

    => (L + 200)/S = 20

    => L/S + 200/S = 20

    But from (1) L/S = 10

    => 200/S = 20 - 10

    => S = 20 m/s

    Then, from (1)

    => L = 10 x 20 = 200 mts.

    Hence, the length of the train = 200 mts.

  • Tags: AIEEE, Bank Exams, CAT, GATE, Bank Clerk, Bank PO

    More questions

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    • Options
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    • B. 1 : 1
    • C. 3 : 4
    • D. 4 : 3
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    • 2. A train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?

    • Options
    • A. 65 sec
    • B. 89 sec
    • C. 100 sec
    • D. 150 sec
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