Taking sound as 340.29 metres / second at sea level.
= 1116.437 feet / sec.
Then 1 / 1116.437 = 0.00089571 seconds (8.9571 * 10-4 seconds in scientific notation.)
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Well, isn't that a lovely question! Sound travels at about 343 meters per second in air. To find out how long it will take for sound to travel 40,000 kilometers, we need to convert that distance to meters and then divide it by the speed of sound. So, it will take approximately 32 hours for the sound to travel that distance. Just imagine all the beautiful landscapes and happy little trees the sound will pass along the way!
It takes 1.3 to 1.4 nanoseconds for light to travel 1 foot.
One nanosecond.
about six minuets