Work Problem: First hose can fill in 20 min while the second hose needs only 16 min

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Two hoses were used to fill a water trough.
The first hose can fill it in 20 minutes while the second hose needs only 16 minutes.
If the second hose is used for the first 4 minutes and then the first hose is also used,
how long will it take them to fill the trough?

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