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Home->Aptitude->Pipes and Cistern -> Important Formulas

Pipes and Cistern :-

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IMPORTANT EXAMPLES
::Important Formulas

Here Some Basic Formulas/Rules Are given below :-

  1. Inlet : A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.
    Outlet : A pipe connected with a tank or a cistern or a reservoir, emptying it, is known as an outlet.

    1. If a pipe can fill a tank in x hours, then :
      part filled in 1 hour = 1/x

    2. If a pipe can empty a full tank in y hours,' then :
      part emptied in 1 hour = 1/y

    3. If a pipe can -fill a tank in i hours and another pipe can empty the full tank in y hours (where y > x), then on opening both the pipes, the net part filled in 1 hour
      = 1/x - 1/y

    4. If a pipe can fill a tank in x hours and another pipe can empty the full tank in y hours (where x > y), then on opening both the pipes, the net part emptied in 1 hour
      = 1/y - 1/x

Click Here for Important Examples