Hand 1:
The 2 on the turn didn't hit much but A3 or 36, which is unlikely he shows up with either of those hands and semi-bluffs the flop with it. While it is likely he has 55,44 there is only 6 total combos of those hands. Remember this is 10nl so they play TPDK like the nuts and there is 8 combos of KQ, and another 8 of JQ, which you are ahead of both. I'm playing for stacks here, raising/shoving the turn.

Hand 2:
Imo, this is either a shove or fold. I would shove here because you have already put in 1/4 of what you have to call here. so it's another 15bb for the pot of over 30bb so your getting 2:1 on your call, and your more than 33% to win here.

Hopefully none of my math is totally off, as I'm just getting a feel for putting it into action.