The idea i had was to have the noob use an AE effect on mobs to tag them all and have a cleric put hots and heals on him ( if that even works ) while the rest of the team kill them all. So the noob would, in effect, be getting the exp that would normally take a full group of people to do. Just tagging one mob at a time would be ok.. but finding great AE grinding spots might be better or rifts.

Also just quest boosting might be an option. Just follow the nub around, help him kill quest mobs for faster questing.