 #### Explanation / Important formulas:

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
• If a pipe can fill a tank in y/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/x – 1/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/y – 1/x)

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