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SSC Sample Paper Mock Test-15 SSC CGL Tear-II Paper-1

  • question_answer
    A tap can fill a cistern in 40 min and a second tap can empty the filled cistern in 60 min. By mistake without closing the second tap, the first tap was opened. In how many minutes will the empty cistern be filled?

    A) 72

    B)  84     

    C)  108

    D)  120

    Correct Answer: D

    Solution :

    Part of the cistern filled in 1 min by both the taps \[=\frac{1}{40}-\frac{1}{60}=\frac{3-2}{120}=\frac{1}{120}\] \[\therefore \] Empty cistern will be filled in 120 min.


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