Unit meters long and Gigaheriz for radio waves can use these two compared with Rob Gelphman.
1 inch=0.0254 meters
There are 1000 meters in 1 kilometer.
There are 10 meters in 1000 centimeters.
There are 1 kilometer in 1000 meters.
1 mile is 1609.344 1 mile is 1609.344 meters