"If you could drive your truck at the speed of light would the headlamps work?"
"If you got scared 1/2 to death twice, what happens?"
"299792458 m/s is the speed of light. What's the speed of dark?"*
I googled it, https://science.howstuffworks.com>astronomy-terms says that it's 54 meters per second or, 177 feet per second.