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Home Aptitude Problems on Trains See What Others Are Saying!
  • Question
  • An Engine length 1000 m moving at 10 m/s. A bird is flying from engine to end with 'x' m/s and coming back at '2x' m/s. Take total time of bird travelling as 187.5 s. Find x and 2x in km/hr ?


  • Options
  • A. 21.4 and 42.8
  • B. 25.2 and 50.4
  • C. 31.4208 and 62.8416
  • D. 33.12 and 66.24

  • Correct Answer
  • 31.4208 and 62.8416 

    Explanation

    Birds speeds in mtrs/sec is 'x' and '2x' .
    While flying from Engine to end, relative speed = (x+10) m/sec
    from end to engine, flying speed = (2x - 10) mtr/sec
    so
    1000/(x+10) + 1000/(2x-10) = 187.5 secs
    solving it, we get
    so x = 8.728 m/sec and 2x= 17.456 m/sec

    x = 31.4208 km/hr and 2x = 62.8416 km/hr.

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

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