πŸ“’ Too many exams? Don’t know which one suits you best? Book Your Free Expert πŸ‘‰ call Now!

  • google app store apple app store
  • βœ–

      Question

      Speed of a boat in still water is 6 times more than the

      speed of stream. If boat covers 112 km in downstream in 8 hours, then find the time taken by the boat to cover 90 km in upstream.
      A 12 hours Correct Answer Incorrect Answer
      B 10 hours Correct Answer Incorrect Answer
      C 8 hours Correct Answer Incorrect Answer
      D 9 hours Correct Answer Incorrect Answer
      E 7 hours Correct Answer Incorrect Answer

      Solution

      Let the speed of stream be β€˜x’ km/hr. So, speed of boat in still water = 6 Γ— x = 6x km/hr Downstream speed of boat = 6x + x = 7x km/hr According to question; 7x = 112/8 = 14 Or, x = 2 Upstream speed of the boat = 6x – x = 5x = 5 Γ— 2 = 10 km/hr Required time taken = 90/10 = 9 hours

      Practice Next
      ask-question