Answer:
Darkness is the absence of light. There is no speed of darkness.
I guess you could say that darkness "arrives" when light departs. So the speed that light "leaves" the observed space would be the speed of darkness; meaning the speed of darkness would be the speed of light, about 3.00 × 108 m/s. The same reasoning is behind the statement "there is no 'cold,' only the absence of heat."
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