Mechanim exact speed, eg 10m/s

Hi, how would you get your Mechanim character moving at an exact speed, eg 10m/s?

My understanding is that normally Mechanim is set up with a speed 0..1 which you could use to blend between walking and running etc, but the actual top speed is embedded in the running animation.

Assuming a speed of 1 is faster than 10m/s, how would you find the value in 0..1 that gives you exactly ten meters per second?

I'm guessing that with simple blend trees speeds are interpolated linearly, but ideally there would be a method that does not involve any inspection of the blend tree.