When presented with an 88-word passage with an average of 6.1 letters per word, and then asked to re-type it and then read it…
Typed: 40 WPM
Read: 116 WPM
My ratio is 10 : 29, meaning I can type 34% as fast as I can speak.
I devised the results myself, but you can take a quiz here and do the math.