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      Question

      A boat travels 300 km downstream and 200 km upstream in

      20 hours. If the ratio of the speed of the boat in still water to the speed of the stream is 5:1, then find the speed of the boat in downstream.
      A 18 km/h Correct Answer Incorrect Answer
      B 24 km/h Correct Answer Incorrect Answer
      C 30 km/h Correct Answer Incorrect Answer
      D 36 km/h Correct Answer Incorrect Answer

      Solution

      Let speed of stream = 'x' km/h Then speed of boat in still water = 5x km/h ATP, (300/6x) + (200/4x) = 20 (50/x) + (50/x) = 20 {(50 + 50) /x} = 20 (100/x) = 20 x = 5 therefore, downstream speed of the boat = 6x = 6 X 5 = 30 km/h

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