Aptitude - Pipes and Cistern

Exercise :: Pipes and Cistern - Important Formulas

  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 cistern or reservoir, emptying it, is known as an outlet.

  2. If a pipe can fill a tank in x hours, then:

    part filled in 1 hour = 1 .
    x

  3. If a pipe can empty a tank in y hours, then:

    part emptied in 1 hour = 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 y > x), then on opening both the pipes, then

    the net part filled in 1 hour = 1 - 1 .
    x y

  5. 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, then

    the net part emptied in 1 hour = 1 - 1 .
    y x