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From @KLOL506: Speed for catching fire has been revised to Mach 2.02462 (2500 kmh or 694.4444 m/s). You can check our References for Common Feats Page.The thought experiment: How fast would I have to run to catch fire?
Essential reading for The Flash.www.sciencefocus.com
and how the heck would i do that now huh?That's for clothes catching fire, which they do at lower temperatures than our bodies, so i think mach 5 is still the norm for it.
However, those are flowers in the feat so i think you'd need to calc this separately