Practice Test Discussion

Q)

If three pipes X, Y, Z can fill a cistern separately in 4, 5 and 10 hours respectively, then the time taken by all the three pipes to fill the tank when all pipes are opened together is?


  • Explanation

    According to the formula, If pipe A  and B fills a tank in x and y hours respectively, but a third pipe C empties the full tank in z hours then the net portion filled in 1 hour when all of them are opened together is xyzxy+yz+zxhours.

    So,

     4×5×10(4×5)+(5×10)+(4×10)=200110=2011 or 1911hours

    The tank will be filled in 1911 hours when all the pipes are opened simultaneously.

    Hence option C is correct

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    Pipes and cisterns

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