Pipes and Cisterns -> IMPORTANT FACTS AND FORMULAE
| Inlet : A pipe connected with a tank or a certain 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. | |
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I. If a pipe can fill a tank in x hours, then : part filled in 1 hour = 1 / x. | |
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II. If a pipe can fill a tank in y hours, then : part emptied in 1 hour = 1 / y. | |
| III. 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, the net part filled in 1 hour = (1/x - 1/y). | |
| IV. 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). | |