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The speed of light is 300,000,000 m/s, and the speed of sound (in air) is 343...

The speed of light is 300,000,000 m/s, and the speed of sound (in air) is 343 m/s. What is the speed of dark? What is the speed of silence?

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Let us assume you are in room you hold an object in one hand and torch in other hand now as you turn on the torch you see the object and shadow at same time and as you turn of the torch it's dark hence it shows that's speed of dark is same as speed of light as soon as light disappeared there is dark .

As in city when shut down occur all light turn off at speed of light and dark is produced at speed of light

Darkness can't travel it only produced when there is no light there is darkness

Now you speak Hi and your friend is standing a distance apart from you. You say Hi and then silence like no sound is produced . So he will hear Hi at speed of sound and then nothing only silence so speed of silence is also same as the speed of sound. You can understand with bass of speaker

That silence between the beat you observed is between two sound beats so that is travelling with same speed as sound

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