With this information, you can calculate the quantity of feet per second 138 kilometers per hour is equal to.

¿What is the inverse calculation between 1 foot per second and 138 kilometers per hour?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.0079513043 times 138 kilometers per hour.

Which is the same to say that 138 kilometers per hour is 125.76553 feet per second.

One hundred thirty-eight kilometers per hour equals to one hundred twenty-five feet per second. *Approximation

A foot per second is zero times one hundred thirty-eight kilometers per hour. *Approximation