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    Question

    The time difference for a boat to travel 600 km upstream

    and 300 km downstream is 15 hours. The boat moves at a speed of ‘6x’ km/hr and the stream flows at ‘x’ km/hr. What is the value of x?
    A 2 Correct Answer Incorrect Answer
    B 6 Correct Answer Incorrect Answer
    C 8 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    [600 / (6x - x)] - [300 / (6x + x)] = 15

    [600 / 5x] - [300 / 7x] = 15

    [4200 / 35x] = 15

    35x = 4200 / 15

    35x = 280

    x = 8

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