Endgame Study #2

Hello everyone, today I've decided to pull out one of my endgame studies books called Chess Handbook of Brilliant and Instructive Endgames by A.A. Troitzky! Here is an endgame study where you, as white, have to figure out how to win with R+B vs Q! Good luck!

I hope you guys enjoyed that one, and hopefully some of you were stumped and had to be given a hint! I think this really is a brilliant puzzle, let me know in the comments if you solved it! If you're looking for a slightly easier problem to solve, make sure to check out my first endgame study, which is relatively easier. Happy solving!