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From what I read from a previous comment, even Sonic is faster than RD, as a Sonic Rainboom is considered to be Mach 5, while Sonic can run up to speeds up Mach 10.
Don’t confuse Flash for Superfriends Aquaman. Seen enough of Flash to leave people as a skidmark… If he wanted to, he could make go back in time and make sure you don’t exist. Check out “Flashpoint” stuff got real in there.
Flash can run so fast he time travels. He can literally reach the finish line before the race starts. That means he’s faster than instantaneous travel.