SPEED OF DARKNESS?

IN PHYSICS I OFTEN GET STRUCK OF A QUESTION OF NOT A SINGLE TEACHER OR MY FRIENDS COULD ANSWER ME THE QUESTION IS THAT "IF SPEED OF LIGHT IS 3 x 108 METRE PER SEC, THAN WHAT IS THE SPEED OF DARKNESS????…."   Asked  Taoqeer Nezam Related articles Cosmological Mysteries Needing Answers(gregbentall.com)