SSC Sample Paper SSC CGL - Sample Paper-10

  • question_answer
    Two pipes A and B can fill a cistern in 37 - min and 45 min 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 min            

    B)  10 min

    C)  5 min              

    D)  9 min

    Correct Answer: D

    Solution :

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

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