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      Question

      The speed of a boat in still water is┬а 15 km/h , and

      the speed of the stream is┬а 3 km/h . How much time will it take to travel┬а 36 km upstream ┬аand┬а 54 km downstream ?
      A 1 hrs Correct Answer Incorrect Answer
      B 3 hrs Correct Answer Incorrect Answer
      C 6 hrs Correct Answer Incorrect Answer
      D 9 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Upstream speed = 15 тИТ 3 = 12 km/h Downstream speed = 15 + 3 = 18 km/h Time upstream = 36 / 12 = 3 hours Time downstream = 54 / 18 = 3 hours Total time = 3 + 3 = 6 hours

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