With this information, you can calculate the quantity of knots 642 miles per hour is equal to.

¿What is the inverse calculation between 1 knot and 642 miles per hour?

Performing the inverse calculation of the relationship between units, we obtain that 1 knot is 0.0017924914 times 642 miles per hour.

Which is the same to say that 642 miles per hour is 557.88275 knots.

Six hundred forty-two miles per hour equals to five hundred fifty-seven knots. *Approximation

A knot is zero times six hundred forty-two miles per hour. *Approximation