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    Question

    The speed of a boat in still water is 2 times more than

    that of the current. If the boat takes 12 hours to cover 144 km upstream, then find the time taken by the boat to cover 480 km downstream.
    A 18 hours Correct Answer Incorrect Answer
    B 19 hours Correct Answer Incorrect Answer
    C 20 hours Correct Answer Incorrect Answer
    D 21 hours Correct Answer Incorrect Answer

    Solution

    Let the speed of the current be ‘x’ km/hr
    Therefore, speed of the boat in still water = 3x km/hr
    According to the question,
    3x – x = 144 / 12
    Or, 2x = 12
    Or, x = 6 km/h
    Required time taken = 480 / (3x + x) = 480 / (4 × 6) = 480/24 = 20 hours

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