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SSC Sample Paper SSC-CGL TIER - I Sample Test Paper-8

  • question_answer
    Two pipes A and B can fill a cistern in 20 minutes and 25 minutes respectively. Both are opened but B is closed after 5 minutes. What will be the time taken (in minutes) to fill the cistern?

    A) 17                                

    B) 11

    C) 15                                

    D) 16

    Correct Answer: B

    Solution :

    Suppose A takes x minutes more after 5 minutes of working together with B to fill the cistern then, \[\frac{5}{25}+\frac{5+x}{20}=1\] \[\Rightarrow \,\,\,\,20+25+5x=100\]\[\Rightarrow \,\,\,\,x=\]11 minutes


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