Answer 1:
The circumference of the Earth around the equator
is 40077 km, and the polar circumference is 40005
km. We could round this to 40 000 km or 40 000 000
m. The speed of light is 299 792 458 m / sec
in vacuum. This means the light travels 299 792
458 m in 1 sec and it will take for 40 000
000 m about 1/7 of a sec, since light will be a
little bit slower in air than it is in vacuum.
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