Pipes and Cistern
- 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.
- If a pipe can fill a tank in x hours, then:
part filled in 1 hour = 1 . x - If a pipe can empty a tank in y hours, then:
part emptied in 1 hour = 1 . y - 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 - 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
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