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      Question

      The ratio between the downstream speed and upstream speed

      of boat is 3:2 respectively. If boat can cover 180 km upstream in 15 hours, then find the speed of boat in still water.
      A 12 km/hr Correct Answer Incorrect Answer
      B 18 km/hr Correct Answer Incorrect Answer
      C 15 km/hr Correct Answer Incorrect Answer
      D 9 km/hr Correct Answer Incorrect Answer

      Solution

      Let the downstream speed and upstream speed of boat be 3x km/hr and 2x km/hr

      So, the upstream speed of boat = (180/15) = 12 km/hr

      So, 12 = 2x

      So, 'x' = 6

      So, the speed of boat in still water = {(3x + 2x) /2} = 2.5x

      = 2.5 X 6 = 15 km/hr

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