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CLAT CLAT Solved Paper-2013

  • question_answer
    Pipe A can fill a tank in 10 h and pipe B can fill the same tank in 12 h. Both the pipes are opened to fill the tank and after 3 h pipe A is closed. Pipe B will fill the remaining part of the tank in

    A)  5 h                             

    B)  4 h

    C)  5 h 24 min                 

    D)  3 h

    Correct Answer: C

    Solution :

    Ans.  Part filled by pipe A in 1 \[h=\frac{1}{10}\] Part filled by pipe B in 1 \[h=\frac{1}{12}\] \[\therefore \] Total part filled by pipe A and B in 3 h \[=3\left( \frac{1}{10}+\frac{1}{12} \right)=3\,\left( \frac{6+5}{60} \right)=\frac{11}{20}\] \[\therefore \] Part left \[=1-\frac{11}{20}=\frac{9}{20}\] Now, \[\frac{9}{20}\] part is filled by pipe B in \[=\frac{9}{20}\times 12=5\] h 24 min .


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