Solution:

A nautical mile measures distance and a knot measures speed.
A nautical mile is based on the circumference of the earth, and is equal to one minute of latitude. It is slightly more than a statute (land measured) mile (1 nautical mile = 1.1508 statute miles ). Nautical miles are used for charting and navigating.
A nautical mile is a unit of measurement used in air, marine, and space navigation, and for the definition of territorial waters.The derived unit of speed is the knot, one nautical mile per hour.