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SSC Sample Paper Mock Test-3 SSC CGL Tear-II Paper-1

  • question_answer
    Two pipes A and B can separately fill a tank in 12 min and 15 min, respectively. Both the pipes are opened together. But 4 min after the start pipe A is turned off. How much time it will take to fill the tank?

    A)  11 min            

    B)  6 min

    C)  12 min            

    D)  8 min

    Correct Answer: B

    Solution :

    Part of tank filled by A in a minute \[=\frac{1}{12}\] Part of tank filled by B in a minute \[=\frac{1}{15}\] \[\therefore \]Total part filled in a minute \[=\frac{1}{12}+\frac{1}{15}=\frac{3}{20}\] \[\therefore \]Part filled in 4 mm \[=\frac{4\times 3}{20}=\frac{3}{5}\] Now, remaining part \[=1-\frac{3}{5}=\frac{2}{5}\] \[\therefore \]Greater part, more time \[\frac{1}{15}:\frac{2}{5}::1\]\[\Rightarrow \]\[\frac{x}{15}=\frac{2}{5}\therefore x=6\,\,\min \]


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