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    Question

    A boat can travel 200 km downstream in 8 hours and 48 km

    upstream in 12 hours. Find the speed of the current.
    A 12.9 km/h Correct Answer Incorrect Answer
    B 8.5 km/h Correct Answer Incorrect Answer
    C 4.9 km/h Correct Answer Incorrect Answer
    D 10.5 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat in still water be 'x' km/hr and the speed of the current be 'y' km/hr. According to the question, On solving equations (1) and (2), we add them to get: 2x=29⇒x=14.5 km/hr Then substituting back to find 'y':  25−14.5=y=10.5 km/hr Speed of the current = 10.5 km/hr

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