When you are listening to Audible audio books on your Amazon Echo, Alexa now lets you adjust the REading Speed by saying Alexa:
Read Faster (up to max 150 percent),
Read Slower (down to 75 percent) or
Read at Normal Speed (back to 100 percent).
Finally we have at least some control of Auidble audio books speed as we do on the Iphone, not as fast, but certainlyh better than nothing.
Now I can really enjoy my Amazon Echo with my Audible books the way I like to listen to them.