You're asking to convert a speed from knots to miles per hour, but the question states the speed is already in knots (35 knots).

Therefore, the speed of the boat is already in the desired unit: 35 knots.

If you wanted to convert knots to miles per hour, you would use the following conversion:

* 1 knot = 1.15078 miles per hour

Let me know if you have any other questions!