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by haiku2077 339 days ago
60 comes from the electrical grid - 20th century TV used the electrical grid to sync rather than forcing every TV to have a perfectly synced clock. Regions that didn't have 60Hz electrical grids used other standard framerates.

24 comes from the first "talkies" that had syncronized sound - it was the lowest framerate that sounded good. Before that, silent films were often at lower framerates to reduce the cost of film.