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    Question

    A boat takes 9 hours more to cover 270 km upstream than to

    travel 180 km downstream. If the speed of the boat is ‘4x’ km/hr and the speed of the stream is ‘x’ km/hr, find x.
    A 2 Correct Answer Incorrect Answer
    B 6 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,
    [270 / (4x - x)] - [180 / (4x + x)] = 9

    [270 / 3x] - [180 / 5x] = 9

    [1350 / 15x] = 9

    15x = 1350 / 9

    15x = 150

    x = 10

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