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Home Aptitude Boats and Streams See What Others Are Saying!
  • Question
  • Equal distance is covered by a boat in upstream and in downstream in total 5 hours. Sum of speed of a boat in upstream and downstream is 40 km/hr. Speed of boat in still water is 600% more than the speed of stream. Find theapproximate distance covered by boat in downstream (in km).


  • Options
  • A. 45
  • B. 50
  • C. 55
  • D. 60

  • Correct Answer
  • 50 

    Explanation

    let speed of boat= X, speed of stream= Y
    Upstream speed= X-Y
    Downstream speed= X+Y
    Sum of upstream & downstream= (X-Y) +(X+Y)= 2X
    So, 2X= 40
    X= 20 km/hr
    Speed of boat : speed of stream= 600+100 :100= 7:1
    So speed of Stream= 20/7 km/hr
    ATQ, D/( X-Y) + D/( X+Y) = 5
    D/(120/7) + D/(160/7)= 5
    D= 480×5/49= 48.97 km= 50 Km(approx)

  • Tags: Bank Exams, GATE

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