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You need to kill the mobs, near to where the alts are standing for them to get creditted with xp. I have boosted 2 alts all the way up to lvl 51(so far) using my 80 hunter. In lower lvl dungeons i get my pet to go around and tag as many mobs in the dungeon as i can, then call him back to me at the start of the instance. I stand about 10 yards in front of the alts and AoE everything down. The alts gain about a level per dungeon clear on average. The alts are currently at about 20hrs /played at lvl 51.
Currently doing Strat to level them, which is a bit more tricky with my hunter. I just chain pull everything and have the 2 alts follow me. Might try Scholo soon for some variation.
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As Slash said, you have to pull groups back to the alts, to get XP, if you leave the alts at door and the 80 is too far ahead, you won't get anything.