The maximum speed of the TS Kennedy is 20 knots.
A nautical mile is the distance between two points or minutes of latitude on the globe.
The speed of a vehicle on land is measured in miles per hour.
It's easy to convert knots to miles per hour. Multiply knots by 1.15 to get miles per hour.
If the TS Kennedy was traveling at her maximum speed of 20 knots (which she rarely does), she would be traveling at approximately 23 miles per hour.