I thought walking was defined by constantly having contact with the ground with at least one foot, not by actual speed? Besides, the speed of light is over 1 billion km/h (1,079,252,849), 670,616,630 mph, or mach 904,019.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram