system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Given the enormous difference in speed between sound and light, how is it possible that when watching a movie the audio and video are in sync? Shouldn't the light from the TV reach my eyes nearly 900,000 times faster than the sound reaches my ears?
gpt
Yes, the light does reach your eyes faster than the sound does. However the difference in timing isn't something you can notice unless you are sitting a great distance away from the source; most people aren't viewing their screen from half a mile away.

To complicate matters your brain doesn't even process visual stimulus at the same speed as auditory stimulus. Vision is much more complex so it takes slightly longer to process than sound, meaning if you are anywhere near your television that likely overshadows any difference in travel time anyway.