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It is stated that the shoes can reach between speed of sound and speed of light (767 mph to 670.6 million mph) https://phineasandferb.fandom.com/wiki/Super_Shoes#Background_Information
It can reach beyond sound but below near the speed of light, which makes it her travel speed with the Super Shoes possibly between Supersonic to Relativistic+
It can reach beyond sound but below near the speed of light, which makes it her travel speed with the Super Shoes possibly between Supersonic to Relativistic+
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