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Question

A pipe can fill a cistern in 9 hours. Due to a leak in its bottom, the cistern fills up in 10 hours. If the cistern is full, in how much time will It be emptied by the leak?


Solution

The inlet pipe's 1 hour's work =19

The leak and inlet's 1 hours work =110

Leak's 1 hour work =19110

=10990=190

The leak can empty the cistern in =90 hours

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