Change TTS speech speed on Android 5.0

From menu goto 

Settings -> Accessibility -> Text-to-speech Output -> Speech Rate
and set speed rate you like

Change TTS speech speed on Android 4.4.2

From menu goto 

Settings -> Accessibility -> Text-to-speech Output -> Speech Rate
and set speed rate you like

Change TTS speed Android 4.22

goto

Settings -> Accessibility -> Text-to-speech Output -> Speech Rate
and set speed rate you like

Change TTS speed Android 4.1

To change speech speed on android 4.1
goto
Settings -> Accessibility -> Text-to-speech Output -> Speech Rate
and set speed rate you like

Activate or deactivate reading text