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      Question

      A boat can travel 36 km downstream in 40 min. The ratio

      of the speed of the boat in still water to the speed of the stream is 5: 4. How much time will the boat take to cover 22 km upstream?
      A 1(5/6) hr Correct Answer Incorrect Answer
      B 3(2/3) hr Correct Answer Incorrect Answer
      C 1(1/4) hr Correct Answer Incorrect Answer
      D 2(1/7) hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of downstream = D/T = 36 × (60/40) = 54 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 4 (5x, 4x) => 9x = 54 => x = 6 Speed of upstream = 5x – 4x = x = 6 km/hr Distance = 22 km Time = D/S = 22/6 = 3(2/3) hr

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