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      Question

      A boatman covers 240 km upstream in 4 hours, and 432 km

      downstream in 6 hours. Find the time taken by the boatman to cover 528 km in still water.
      A 4 hrs Correct Answer Incorrect Answer
      B 5 hrs Correct Answer Incorrect Answer
      C 6 hrs Correct Answer Incorrect Answer
      D 8 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Upstream speed = 240/4 = 60 km/h
      Downstream speed = 432/6 = 72 km/h
      Speed in still water = (60 + 72)/2 = 66 km/h
      Required time = 528/66 = 8 hours

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