Changing speech rate for read function (text to speech)
Please refer to the official Google tutorial if you are running Android 7.0 and up here:
https://support.google.com/accessibility/android/answer/6006983?hl=en
The following instructions are for devices running Android 5.0 and up.
1. Go to your devices Settings and tap Language & input
2. Tap Text-to-speech output
3. Tap Speech rate
4. Select desired speed