Under either of the two competing interpretations here, what you’re describing is possible, since moving up to your speed is explicitly a thing you can use the Ready option to move up to your speed. One interpretation says that Readying a Dash could also allow you to do that. I don’t favor this interpretation, in part because why would they write two ways to do exactly the same thing? The other interpretation says that when you Dash, you increase the distance you can move by your speed, but it doesn’t actually allow you to move. If, theoretically, you somehow had two actions and two reactions, you could Ready a Dash and Ready movement to move 60 feet.