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This question is not about why the speed of light is not greater than 299,792,458 m/s. It's about why it's that exact value. This was a question from a book(I know homework questions are frowned upon here :P), and after almost 5 years, this has occurred back to me.
Is there any specific reason for that value? If it were, say, a scale at the International Bureau of Weights and Measures of exactly one meter length(as the cylinder of the kilogram), it would make sense. But I haven't heard of such a thing.