With this information, you can calculate the quantity of feet per minute 21 miles per hour is equal to.

¿What is the inverse calculation between 1 foot per minute and 21 miles per hour?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per minute is 0.00054112554 times 21 miles per hour.

Which is the same to say that 21 miles per hour is 1848 feet per minute.

Twenty-one miles per hour equals to one thousand eight hundred forty-eight feet per minute. *Approximation

A foot per minute is zero times twenty-one miles per hour. *Approximation