User blog comment:WarrenWitch/Racing stripes/@comment-25555436-20150603235536

Ruby's Semblance may be Super Speed, but at the moment the best she can do with it is a small flash-step. "Flash ain't got nothing on Mizz Rose"...that joke was so horribly and ironically wrong, it's not even funny. Because yeah, the man that can speak faster than the speed of sound and even go back years in time with his super speed, ain't got nothing on Ruby, who can at best make a dash.

Blake does not have anything even remotely close to Super Speed, she's just your typical, average, fast "ninja". Hell, maybe not even average, most ninjas in fiction are faster than her. Her Semblance just makes a shadow clone in the spot she was at that specific second, which pretty much vanishes after 1 hit with anything. As she makes them while moving, or uses them to move, it's more like a semi-physical aftermirage without the need of going fast.

Weiss's speed has been shown consistently, mind you. Except for 1 fact: It's not "her" speed, because she by herself doesn't move fast. She uses her glyphs with no Dust added to go fast. By themselves, the only thing her glyphs can do is PUSH Weiss in a specific direction with a specific speed, basic physics. So the speed she is sent flying is completely variable, she can change it if she wants.

But basically, to answer your question of who would win in a race, Ruby, either with her Semblance or by propulsing herself with CR. If racing in a straight line, maybe Weiss, but if not, then Ruby. Blake would be second if she uses her skills to Parkour, but that depends on the place.