To convert the filling rate from ounces per minute to pints per hour, we can follow these steps:
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Convert ounces to pints: There are 16 ounces in a pint.
\[ \text{Filling rate in pints per minute} = \frac{4 \text{ ounces}}{16 \text{ ounces per pint}} = \frac{4}{16} = 0.25 \text{ pints per minute} \]
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Convert minutes to hours: There are 60 minutes in an hour.
\[ \text{Filling rate in pints per hour} = 0.25 \text{ pints per minute} \times 60 \text{ minutes per hour} = 15 \text{ pints per hour} \]
Thus, the hose fills the tub at a rate of 15 pints per hour.