Sorry if this is a repost I looked and couldn't find one
So I was rushing a guildie through last night and I noticed that he was still getting XP in the room near the end with all the guys who respawn ungodly fast everytime I killed the respawns. (I kept screwing up on things it had been a while)
So I figure if you were to get a caster or something with massive amounts of AoE damage (Mage Druid Death Knight something along those lines) and your level 50 friend you could get him to 58 in no time
the mobs at around level 54 I think it was and have a little over 700HP and respawn in maybe 30 sec so its massive farming and massive XP