To convert 18 feet per hour to inches per hour, you need to know that there are 12 inches in a foot.
Here's the conversion:
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Start with the given rate: \[ 18 \text{ feet/hour} \]
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Multiply by the conversion factor (12 inches per 1 foot): \[ 18 \text{ feet/hour} \times \frac{12 \text{ inches}}{1 \text{ foot}} \]
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Calculate: \[ 18 \times 12 = 216 \text{ inches/hour} \]
So, \( 18 \text{ feet/hour} = 216 \text{ inches/hour} \).