This page explains how to use text to speech output on your Android phone or tablet, which can read content out to you automatically
You can alter the speech rate by tap to select from one of the options:
NOTE: These instructions apply to the standard version of Android as found in the Google Nexus range. They also apply to other devices (as long as they are using the same operating system) but please be aware that there may be minor differences. This is due to the custom ‘skins’ some companies apply to their mobile devices instead of the stock Android theme.