Question

    A boat takes 16 hours longer to travel 640 km upstream than

    to travel 320 km downstream. If the boat and stream speeds are ‘5x’ km/hr and ‘x’ km/hr respectively, calculate 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,
    [640 / (5x - x)] - [320 / (5x + x)] = 16

    [640 / 4x] - [320 / 6x] = 16

    [960 / 6x] = 16

    6x = 960 / 16

    6x = 60

    x = 10

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