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

  • question_answer
    Two pipes can fill a cistern in 12 min and 15 min respectively. A third pipe can empty the cistern in 20 min. How long will it take to fill the cistern if all the three pipes are opened at the same time?

    A) 6 min               

    B)  8 min  

    C)  10 min

    D)  12 min

    Correct Answer: C

    Solution :

    Time taken to fill the cistefnaU thethree pipes are opened\[=\frac{xyz}{yz+zx-xy}\,\,\min \] [Here \[x=12,\]\[y=15,\]\[z=20\]] Required time \[=\frac{12\times 15\times 20}{15\times 20+20\times 12-12\times 15}\] \[=\frac{3600}{300+240-180}=\frac{3600}{360}=10\]min


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