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      Question

      A boat can travel upstream at 12 km/h and downstream at

      18 km/h. What is the speed of the boat in still water?
      A 15 km/h Correct Answer Incorrect Answer
      B 14 km/h Correct Answer Incorrect Answer
      C 16 km/h Correct Answer Incorrect Answer
      D 17 km/h Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water be x km/h and speed of current be y km/h. Then, x - y = 12 (upstream), x + y = 18 (downstream). Adding both equations: 2x = 30 тЖТ x = 15 km/h. Answer: a) 15 km/h.

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