One knot is equal to one nautical mile per hour.

Here's a breakdown:

* Nautical Mile: A nautical mile is approximately 1.15 statute miles (or 1.852 kilometers).

* Knot: Therefore, a knot is equivalent to 1.15 statute miles per hour or 1.852 kilometers per hour.

So, when someone says a boat is traveling at 10 knots, it means it's traveling at 10 nautical miles per hour, or about 11.5 statute miles per hour.