📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!
  • google app store apple app store
    • âś–

      Question

      A boat travels 200 km downstream in 10 hours. The

      difference between its downstream speed and upstream speed is 5 km/h. What is the ratio of the boat's speed in still water to the speed of the stream?
      A 11:12 Correct Answer Incorrect Answer
      B 20:21 Correct Answer Incorrect Answer
      C 21:17 Correct Answer Incorrect Answer
      D 7:1 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ;
      Downstream speed = 200 Ă· 10 = 20 km/h
      Let boat speed in still water = b, stream speed = s
      Downstream = b + s = 20
      Upstream = b – s
      Difference between downstream and upstream = (b + s) – (b – s) = 2s = 5
      Hence s = 2.5
      Then b = 20 – s = 17.5
      Required ratio = 17.5 : 2.5 = 7 : 1

      Practice Next
      More Boats and streams Questions

      Relevant for Exams:

      ask-question