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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