With this information, you can calculate the quantity of knots 640 kilometers per hour is equal to.
¿What is the inverse calculation between 1 knot and 640 kilometers per hour?
Performing the inverse calculation of the relationship between units, we obtain that 1 knot is 0.00289375 times 640 kilometers per hour.
Which is the same to say that 640 kilometers per hour is 345.57235 knots.
Six hundred forty kilometers per hour equals to three hundred forty-five knots. *Approximation
A knot is zero times six hundred forty kilometers per hour. *Approximation
