## Arithmatical - Pipes Cisterns

*Important facts and formulae*

1. |
A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an
A pipe connected with a tank or cistern or reservoir, emptying it, is known as an |
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2. | If a pipe can fill a tank in x hours, then : part filled in 1 hour = |
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3. | I. If a pipe can empty a tank in y hours, then : part emptied in 1 hour = II. 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 = 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, then the net part emptied in 1 hour = |
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