Interesting hand quiz

[Yeti]

Stolen from www.tillerman.net :

Poker Question
This hand happened at 25/50 (NL $5000). My friend and I were discussing the hand, (he was in the hand not me).

Two players limp in middle position for $50, my friend calls on the button with K8cc.

His two opponents are both good/solid players.

The flop comes Qc7d4c.

There is $225 in the pot.

The first player bets out $220 UTG and the second player calls the $220. Fold isn't an option, so you just have to decide to call or raise?

My friend called. All players had around $5000 in their stack at the start of the hand.

The pot is now $885.

The turn comes the 2c giving my friend the second nut flush.

His first opponent now bet $885, a full pot sized bet. His second opponent called this $885 bet and it was now up to my friend to act.

There is $2665 in the pot now. You have $4730 left. Do you call, raise or fold?

Now 3 scenarios :-

1. You call, the river comes a blank giving you still the 2nd nuts. There is $3540 in the pot. The first opponent pushes all in for around the size of the pot and the second opponent also calls. Do you call or fold?

2. Same as the first scenario except the first opponent checks the river and the second opponent pushes all in for around the size of the pot. Do you call or fold?

3. You call, the river comes the Qd pairing up the board. The first player checks and the second player bets $1600 (slightly less than half the pot). Do you call, fold or push all in?

That is five different questions. Look for the question marks! I'll tell you my friends actions and the results of the hand after enough people have commented. I will also give my own thoughts too. Analysis/Reasoning along with the answers in your comments please.