Multiple Choice Questions on Two pipes P and Q can fill a tank in 20m and 30m respectively If both the pipes are opened simu........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two pipes P and Q can fill a tank in 20m and 30m respectively If both the pipes are opened simu...........

Quant (SSC) Pipes&cistern
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    Two  pipes P and Q can fill a tank in 20m and 30m respectively. If both the pipes are opened simultaneously, after how much time should Q be closed so that the tank is full in 16minutes ?

    12min

    Incorrect Answer

    6min
     

    Correct Answer

    10min

    Incorrect Answer

    7min

    Incorrect Answer
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    Explanation:

    X(1/20+1/30) + (16-x)1/20 = 1
    5x/60+16-x/20 =1
    5x+48-3x/60 =1
    2x+48 = 60
    2x=12
    X=12/2 = 6
    Hence, option 2 is the correct answer.

    By: Amit Kumar
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