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!
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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.)
The number of hours it will take to travel 308 miles is(308)/(your average speed, in miles per hour)
It would depend on your speed
3 months
About 37 minutes at 65 mph