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  • Question

  • The ratio of the speed of a boat downstream and speed of the stream is 9:1. If the speed of the current is 3 km per hr, find the distance travelled by the boat upstream in 5 hours.


  • Options
  • A. 100 km
  • B. 98 km
  • C. 109 km
  • D. 105 km

  • Correct Answer
  • 105 km 

    Explanation

    Let the speed of boat in still water is ?x? km/hr & that of stream is ?y? km/hr.
    Then, ATQ
    (x+y)/y = 9/1 9y = x + y
    x = 8y
    y = 3 km/hr
    So, x = 24 km/hr
    Upstream speed = 24-3 = 21 km/hr
    Hence, distance travelled upstream in 5 hours = 21*5 = 105 km.

    • Tags: Bank Exams

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