Number 3 is easily answered. The speed of darkness is basically the speed of light, as the light is turned off. Picture light as a blanket that covers the room, starting from the light-bulb and growing at a extremely high speed to cover the whole room. Now imagine a vacuum suck up the blanket from the same place as the light-bulb. If you still don't get it, keep these in mind.
Light is an actual thing, that's why black holes can suck it into their center.
Darkness is the lack of light, not a particle or wave (depending on what you think light is).
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Number 3 is easily answered.
Number 3 is easily answered. The speed of darkness is basically the speed of light, as the light is turned off. Picture light as a blanket that covers the room, starting from the light-bulb and growing at a extremely high speed to cover the whole room. Now imagine a vacuum suck up the blanket from the same place as the light-bulb. If you still don't get it, keep these in mind.
Light is an actual thing, that's why black holes can suck it into their center.
Darkness is the lack of light, not a particle or wave (depending on what you think light is).