Draw?

Im pretty sure to win this ending you have to have your king behind the pawns. After he plays Rb1 your pawns will quickly fall.

So i reached this position in a game were i had one min left, is there a way for white to win here? Edit: the pawns were actualy one step closer to queening but i dont think it makes a difference.
I have played a game with a similar position:
http://www.chess.com/forum/view/endgames/how-can-i-win-this
and I don't know if it is won or not