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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-4

  • question_answer
    Two pipes A and B can fill a cistern in \[37\frac{1}{2}\] minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled just in half an hour, if the pipe B is turned off after

    A)  15 minutes                   

    B)  10 minutes

    C)  5 minutes         

    D)         9 minutes  

    Correct Answer: D

    Solution :

     Pipe \[A\] fills the tank in \[\frac{75}{2}\]minutes. \[\therefore \]Part of the tank filled by A in 30 minutes\[=\frac{2}{75}\times 30=\frac{4}{5}\] Remaining part\[=1-\frac{4}{5}=\frac{1}{5}\] Now, 1 part is filled by pipe B in 45 minutes \[\therefore \]      \[\frac{1}{5}\]part is filled in             \[=45\times \frac{1}{5}=9\]minutes Hence, the pipe B should be turned off after 9 minutes.


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