With this information, you can calculate the quantity of feet per second 640 knots is equal to.
¿What is the inverse calculation between 1 foot per second and 640 knots?
Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.00092575594 times 640 knots.
Which is the same to say that 640 knots is 1080.1983 feet per second.
Six hundred forty knots equals to one thousand eighty feet per second. *Approximation
A foot per second is zero times six hundred forty knots. *Approximation
