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    A person swims at a speed of 6 km/h downstream and 2 km/h upstream. His speed in still water is.
    Question

    A person swims at a speed of 6 km/h downstream and 2 km/h upstream. His speed in still water is.

    A.

    3 km/h

    B.

    4 km/h

    C.

    5 km/h

    D.

    6 km/h

    Correct option is B

    Given: A person swims at a speed of 6 km/h downstream and 2 km/h upstream.
    The speed of the swimmer in still water (S) and the speed of the current (C) can be related to the downstream and upstream speeds as follows:
    Downstream speed = S + C = 6km/h
    Upstream speed = S – C = 2km/h
    To find the swimmer's speed in still water, add both equations:
    (S + C) + (S - C) = 6 + 2
    2S = 8
    S = 4km/h
    So, the swimmer's speed in still water is 4km/h.
    Thus, correct option is (b).

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