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      Question

      A boat covers a distance of 57 km upstream in 9.5

      hours. If the boat's speed in still water had been doubled, it would have taken only 2 hours to cover 60 km upstream. What is the speed of the current?
      A 20 km/hr Correct Answer Incorrect Answer
      B 16 km/hr Correct Answer Incorrect Answer
      C 18 km/hr Correct Answer Incorrect Answer
      D 12 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively According to the question, (x – y) = 57/9.5 = 6….. (1) And, 2x – y = 60/2 = 30…. (2) On solving equation (1) and (2), we get Speed of the current = y = 18 km/hr

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