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      Question

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

      upstream is 7: 6. If the boat can travel 440 km in downstream in 5 hours, then find the time taken by the boat to cover 38.5 km in still water.
      A 39 minutes Correct Answer Incorrect Answer
      B 45 minutes Correct Answer Incorrect Answer
      C 20 minutes Correct Answer Incorrect Answer
      D 30 minutes Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water and speed of boat in upstream be тАШ7xтАЩ km/h and тАШ6xтАЩ km/h, respectively. Speed of stream = 7x тАУ 6x = x km/h Speed of boat in downstream = 7x + x = 8x km/h So, 8x = 440/5 => x = 11 Speed of boat in still water = 7 ├Ч 11 = 77 km/h Desired time = 38.5/77 x 60 = 30 minutes

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