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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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