With this information, you can calculate the quantity of feet per second 639 knots is equal to.
¿What is the inverse calculation between 1 foot per second and 639 knots?
Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.0009272047 times 639 knots.
Which is the same to say that 639 knots is 1078.5105 feet per second.
Six hundred thirty-nine knots equals to one thousand seventy-eight feet per second. *Approximation
A foot per second is zero times six hundred thirty-nine knots. *Approximation
