Watching a thunder sorm, I reflected that as a child I was told to count the seconds affter the lightning and when you heard the thunder that was how many miles away the storm was. Utter tosh, I now find.
For our purposes the speed of light, at 300,000 km per second is infinite. Sound (thunder) travels at 344 metres a second, so it is about a mile for every 5 seconds.
Apologies if you knew this already
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