With this information, you can calculate the quantity of miles per hour 40 knots is equal to.

¿What is the inverse calculation between 1 mile per hour and 40 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 mile per hour is 0.021724406 times 40 knots.

Which is the same to say that 40 knots is 46.031178 miles per hour.

Forty knots equals to forty-six miles per hour. *Approximation

A mile per hour is zero times forty knots. *Approximation