Which hand wins in this poker hand 2h 2c 2d 6d 10d qc Ah ----- 5c 5h kd kh qc 8s 3c 10h -----------kc 7h Ac 9s Jh 8d ks 4s?

Assuming you are playing 7 card stud, 2h 2c 2d 6d 10d Qc Ah will win the pot with 3 of a kind with the Queen and Ace as kickers.

The other hands, (Two pair (5's and K's) are second) and the last hand (High card ace) is the worse hand.

None of these hands qualify for a "Lo" hand if you are playing Hi/Lo 8 or better. So the pot is only won by the first hand, 3 of a kind.