With this information, you can calculate the quantity of feet per second 688 kilometers per hour is equal to.

¿What is the inverse calculation between 1 foot per second and 688 kilometers per hour?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.0015948837 times 688 kilometers per hour.

Which is the same to say that 688 kilometers per hour is 627.00496 feet per second.

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

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