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      Question

      Speed of a boat in still water to speed of boat in

      upstream is 11: 9. If the boat can travel 260 km in downstream in 10 hours, then find the time taken by the boat to cover 44 km in still water.
      A 139 minutes Correct Answer Incorrect Answer
      B 145 minutes Correct Answer Incorrect Answer
      C 120 minutes Correct Answer Incorrect Answer
      D 148 minutes Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water and speed of boat in upstream be тАШ11xтАЩ km/h and тАШ9xтАЩ km/h, respectively. Speed of stream = 11x тАУ 9x = 2x km/h Speed of boat in downstream = 11x + 2x = 13x km/h So, 13x = 260/10 => x = 2 Speed of boat in still water = 11 ├Ч 2 = 22 km/h Desired time = 44/22 x 60 = 120 minutes

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