PHP & Ruby (Passenger) ?

Sorry if this is a bit of an ignorant question :)

I'm in the middle of setting up my Linode 512. So far I have Apache2, MySql & PHP all working nicely.

Can I add Ruby, RoR, Sinatra, Passenger etc… and will they play nice together ?

TIA, Dave

ps: Just to clarify, I don't mean I want to have one domain use both PHP AND Ruby!