How long inlet pipe took to fill pool


The inlet pipe can fill Reynaldo's pool in 5hr, where as the outlet pipe can empty it in 8hr. In his haste to surf  Internet, Reynaldo left both pepies open. How long it took to fill pool.

Second question is speed of the stream is 4mph. The boat travels 10 miles upstream in same time it takes to travel 18 miles downstream. Determine speed of boat in still water?

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Mathematics: How long inlet pipe took to fill pool
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