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    Question

    The difference between the time taken by a boat to travel

    360 km upstream and 240 km downstream is 10 hours. The speed of the boat and the stream are ‘5x’ km/hr and ‘x’ km/hr, respectively. Find x.
    A 2 Correct Answer Incorrect Answer
    B 6 Correct Answer Incorrect Answer
    C 5 Correct Answer Incorrect Answer
    D 9 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    [360 / (5x - x)] - [240 / (5x + x)] = 10

    [360 / 4x] - [240 / 6x] = 10

    [540 / 6x] = 10

    6x = 54

    x = 9

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