macos - Is it possible to change the speech rate in OS X say command?

say -v Alex "Hello"

Is there a way to change the speed of speech like there is in the speech settings of System Preferences -> Date & Time -> Clock -> Customize Voice?

Answer

Yes, there is. The command

say -v Alex "Hello" -r 200

will cause the voice Alex say "Hello" at a rate of 200 words/minute.