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  • Question
  • A jogger desires to run a certain course in 1/4 less time than he usually takes. By What per cent must be increase his average running speed to accopplish the goal?


  • Options
  • A. 50%
  • B. 20%
  • C. 25%
  • D. 331/3

  • Correct Answer
  • 331/3 

    Explanation

    Let usual speed and usual time taken by the jogger are D and T, respectively.
    Let his new speed be D'. Then,
    DT = (3D'/4)T
    ? D = 3D'/4
    ? D' = 4D/3

    Thus, he has to increased his speed by
    [(4D/3 - D) / D] x 100% .
    = 331/3 %


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