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    Two taps P and Q take 60 minutes and 40 minutes to fill a cistern separately. If tap Q is open for the first half time and P alone is open for the rem
    Question

    Two taps P and Q take 60 minutes and 40 minutes to fill a cistern separately. If tap Q is open for the first half time and P alone is open for the remaining time, how long will it take to fill the cistern?

    A.

    48 minutes

    B.

    36 minutes

    C.

    32 minutes

    D.

    45 minutes

    Correct option is A


    L.C.M of 48 and 60 is 120
    Total work = 120 unit
    Let the total time taken to fill the tank be 'x' min
    ⇒Q is opened from x/2 min and P is opened for x/2 min
    3x/2 + 2x/2 = 120
    ⇒x= 48 min
    Both pipes fill the tank in 48 min.

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