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

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

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per minute is 0.00047022524 times 21 knots.

Which is the same to say that 21 knots is 2126.6404 feet per minute.

Twenty-one knots equals to two thousand one hundred twenty-six feet per minute. *Approximation

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