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      Question

      A boat can travel 15 km upstream and 21 km downstream in

      3 hours. Find the speed of the boat in still water if the speed of the stream is 1.5 km/h.
      A 12.5 km/h Correct Answer Incorrect Answer
      B 14.9 km/hr Correct Answer Incorrect Answer
      C 18.8 km/hr Correct Answer Incorrect Answer
      D 15.5 km/hr Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water be β€˜x’ km/h. Upstream speed = β€˜x – 1.5’ km/h Downstream speed = β€˜x + 1.5’ km/h According to the question: Thus, the speed of the boat in still water isΒ  12.5 km/h .

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