Multiple Choice Questions on A man rsquo s downstream speed is 7 kmph and speed of current is 1 kmph the upstream speed of the ma........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A man rsquo s downstream speed is 7 kmph and speed of current is 1 kmph the upstream speed of the ma...........

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    A man’s downstream speed is 7 kmph and speed of current is 1 kmph, the upstream speed of the man is–

    2 kmph

    Incorrect Answer

    3 kmph

    Incorrect Answer

    5 kmph

    Correct Answer

    7 kmph

    Incorrect Answer
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    Explanation:

    Downstream rate = 7 kmph,
    Speed of the Current = 1 kmph
    Let Upstream be x, then
    By the short trick approach, we get
    Speed of the current = 1/2
    [DOWNSTREAM rate – UPSTREAM rate]
    ⇒ 1 = 1/2(7 - x)
    ⇒ 2 = 7  – x    OR    x = 5 km/hr

    By: Amit Kumar
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