To convert miles per minute to feet per minute, we can use the conversion factor that 1 mile is equal to 5,280 feet.
Given that we have 3 miles per minute, we can perform the conversion as follows:
\[ 3 \text{ miles/minute} \times 5,280 \text{ feet/mile} = 15,840 \text{ feet/minute} \]
Thus, 3 miles per minute is equivalent to 15,840 feet per minute.