As of 1983, the definition of a "meter" is based on the speed of light, specifically, the distance that light travels in a vacuum during the time interval 299,792,458^-1 seconds. Electrical signals moving in a cable (for example, the coaxial cable that connects your television to the cable jack in the wall) travel at approximately 70% of the speed of light. Speaking of television, a high-definition (HD) receiver can update its display 60 times per second, where each display frame contains 1280x720 pixels.

So: How far can the television signal travel in a coaxial cable during the time that an HD receiver is drawing a new pixel on the screen?