With this information, you can calculate the quantity of feet per minute 688 knots is equal to.

¿What is the inverse calculation between 1 foot per minute and 688 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per minute is 1.4352805e-05 times 688 knots.

Which is the same to say that 688 knots is 69672.791 feet per minute.

Six hundred eighty-eight knots equals to sixty-nine thousand six hundred seventy-two feet per minute. *Approximation

A foot per minute is one times six hundred eighty-eight knots. *Approximation