With this information, you can calculate the quantity of knots 638 feet per minute is equal to.
¿What is the inverse calculation between 1 knot and 638 feet per minute?
Performing the inverse calculation of the relationship between units, we obtain that 1 knot is 0.1587282 times 638 feet per minute.
Which is the same to say that 638 feet per minute is 6.3000778 knots.
Six hundred thirty-eight feet per minute equals to six knots. *Approximation
A knot is zero times six hundred thirty-eight feet per minute. *Approximation