Question: Why does the internet say that farts travel at 10 ft/s? Short answer: Because the internet is wrong.
The Invisible College of Experimental Flatology was founded in 2020, back before everything turned out OK, at a time when the forces of buffoonery and biology threatened to unravel the fabric of human civilization. The history of this period hardly needs rehashing. Suffice it to say that people were looking for a distraction.