The wave propagation speed in meter per second is the speed at which a wavefront (e.g. an acoustic signal or en electro-magnetic signal such as a radio wavefront, a light pulse in a fibre channel or a change of the electrical voltage on a copper wire) passes through a medium. The propagation speed for transmission in a vacuum, for example wireless communication, is the speed of light, meaning that the VoP of 1 (100%). In electrical cables, the speed mainly depends on the isolating material.
So, now you know.
