With this information, you can calculate the quantity of feet per second 690 knots is equal to.
¿What is the inverse calculation between 1 foot per second and 690 knots?
Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.00085867218 times 690 knots.
Which is the same to say that 690 knots is 1164.5888 feet per second.
Six hundred ninety knots equals to one thousand one hundred sixty-four feet per second. *Approximation
A foot per second is zero times six hundred ninety knots. *Approximation