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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-26

  • question_answer
    A cistern has two pipes. One can fill it with water in 8 h and the other can empty it in 5 h. In how many hours will the cistern be emptied if both the pipes are opened together when\[\frac{3}{4}\]of the cistern is already full of water?

    A) \[3\frac{1}{3}\]h                       

    B)  6 h

    C)  10 h                

    D)  \[13\frac{1}{3}\]h

    Correct Answer: C

    Solution :

    Net part emptied by both in 1 \[h=\left( \frac{1}{5}-\frac{1}{8} \right)=\frac{3}{40}\] \[\frac{3}{40}\]part is emptied in 1h. \[\frac{3}{4}\]part will be emptied in\[\left( \frac{40}{3}\times \frac{3}{4} \right)\,\,h=10\,\,h\]


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