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the record speed is 50 mph or 80kph
Speed has nothing to do with where you are. You can travel below the speed of sound pretty much anywhere.
In 2007 Lithuanian Arvydas Gaiciunas claimed a new world record for holding his breath underwater: 15 minutes, 58 seconds.
The world record, set by David Blaine, is 17 minutes and 4.4 seconds.