Pipes & Cisterns Aptitude Questions And Solutions

Dedicating this thread to questions based on 'Pipes, Water Tanks, Inlet, Outlet' type questions.
Share the questions here and discuss the method to solve them.

It would be great if questions with higher difficulty level are discussed.

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  • Ankita Katdare
    Ankita Katdare

    @abrakadabra • Aug 3, 2011

    I will start with some basic formulae that one should know to solve these kind of problems.

    What is inlet?
    A pipe connected with a tank or cistern that fills it, is called as inlet.

    What is outlet?
    A pipe connected with a tank or cistern that empties it, is called as outlet.

    1. If a pipe can fill a tank in 'n' hours, then the part of tank filled in one hour is 1/n.

    2. If a pipe can empty a tank in 'm' hours, then the part emptied in one hour is 1/m.

    3. If a pipe fills a tank in 'n' hours and another pipe empties the tank in 'm' hours, such that m>n, then on opening both the pipes, the net part filled in one hour is 1/n - 1/m.

    4. If a pipe fills a tank in 'n' hours and another pipe empties the tank in 'm' hours, such that n>m, then on opening both the pipes, the net part emptied in one hour is 1/m - 1/n.

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