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They’re 2 entirely different things. There’s no reason their speeds should be related in any way. Light is electromagnetic waves. It’s not really a physical thing that you can hold or touch. Electromagnetic waves don’t require any medium to propagate. For reasons beyond the scope of this question, all electromagnetic waves travel at the fastest anything in the universe can travel, which, in a vacuum, is just under 300,000 km/s.
Sound, on the other hand, is physical thing. It’s the vibrations that propagate through some physical medium, like air. It’s the actual molecules or atoms of that stuff vibrating. Sound can only travel as fast as those molecules or atoms can bump into each other.
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