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  • Question
  • Mahesh rows to the place 80 km away and back in 20 hours. He finds that he can row 8 km downstream in the same time as 4 km upstream. The speed of the boat in stillwater is


  • Options
  • A. 9 kmph
  • B. 7 kmph
  • C. 2 kmph
  • D. 5 kmph

  • Correct Answer
  • 9 kmph 

    Explanation
    If Mahesh moves 8 km downstream in X hours

    Downstream speed = 8/X kmph

    upstream speed = 4/X kmph

    Now 80/(8/X) + 80/(4/X)=20

    X=2/3

    downstream Speed = 8/(2/3)= 12 kmph

    upstream Speed = 4/(2/3)= 6 kmph

    Rate of the stream = (12+6)/2= 9 kmph

  • Tags: Bank Exams

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    • Options
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    • Options
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