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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-11

  • question_answer
    A pipe can fill a cistern in 5 hours and an another pipe can empty it in 4 hours. If the cistern is completely filled, then after how many hours the cistern will be empty if they are opened together?

    A)  \[9\text{ }hrs\]                       

    B)  \[\text{18 }hrs\]

    C)  \[\text{20 }hrs\]         

    D)  \[\text{20}\frac{1}{2}\text{ }hrs\]

    Correct Answer: C

    Solution :

                 Time taken to empty the tank \[=\frac{1}{\frac{1}{4}-\frac{1}{5}}=\]


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