With this information, you can calculate the quantity of feet per second 646 kilometers per hour is equal to.

¿What is the inverse calculation between 1 foot per second and 646 kilometers per hour?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.0016985759 times 646 kilometers per hour.

Which is the same to say that 646 kilometers per hour is 588.72849 feet per second.

Six hundred forty-six kilometers per hour equals to five hundred eighty-eight feet per second. *Approximation

A foot per second is zero times six hundred forty-six kilometers per hour. *Approximation