Darkness is indeed the absense of reflection of light by definition, it's not so much what we know, but if dark is to be defined, then light has to be defined. Darkness is an adjective, and one might ask if Ты are talking about complete darkness. I would say the speed of darkness as I understand it would be the speed it arrives. The reason it is сказал(-а) that the absense of light is because light is a thing called eloctromagnetic waves.
I could go through a physics lesson или something right now, but I'll just this: DARK DOESN'T MOVE. I'm also 90% sure that it's not even a noun. ._. Болталка song~
Surely the speed of 'dark', which doesn't actually exist as others have already pointed out it is the absence of light, should be the speed a which it takes for the light to vacate the area that is 'dark'?
Or, if it is already 'dark', then there is no speed, unless Ты count the speed at which our eyes recognise that there is no light.
