With this information, you can calculate the quantity of feet per second 18 knots is equal to.
¿What is the inverse calculation between 1 foot per second and 18 knots?
Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.032915767 times 18 knots.
Which is the same to say that 18 knots is 30.380577 feet per second.
Eighteen knots equals to thirty feet per second. *Approximation
A foot per second is zero times eighteen knots. *Approximation