Question

the meter is defined as the distance travelled by light in 1/299792458 second. why didn't people choose some easier number such as 1/300,000,000 second? why not 1 second?

Answer 1

For some of the research like launching rockets, sun light protection, and other reasons
They wanted an exact value

Like while launching a rocket, if any time inequality occurred then it would be crash

So they wanted the exact value

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Answer 2

This is because that is the exact speed of light 299792458m/s so they choose it. Well i personally think they already had choose the limit of one second and after the light of speed was found they gave their explanation.
BUT I DON'T KNOW THE REAL ANSWER