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

      Question

      The speed of a boat in still water and the speed of the

      stream are in the ratio 7:2. If the boat takes 12 hours to travel 240 km upstream, how long will it take the boat to travel 144 km downstream?
      A 2.5 hrs Correct Answer Incorrect Answer
      B 5 hrs Correct Answer Incorrect Answer
      C 3 hrs Correct Answer Incorrect Answer
      D 4 hrs Correct Answer Incorrect Answer
      E 6 hrs Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water and speed of stream be '7x' km/hr and '2x' km/hr, respectively. So, upstream speed of boat = 7x - 2x = '5x' km/hr ATQ, (240/5x) = 12 Or, 'x' = 4 So, downstream speed of the boat = 7x + 2x = 9x = 9 X 4 = 36 km/hr Therefore, required time = (144/36) = 4 hours

      Practice Next
      More Boats and streams Questions

      Relevant for Exams:

      ask-question