"Market" order execution

Just trying to understand how this order type is being executed.

Let's say, we have price 30.10-30.12
I'm sending a 'market' buy order.
What happens next:
1) If market is stable am I got filled at 30.12?
2) If market is moving fast between 30.15 and 30.30, what price would I get?
3) If the market jumped to 30.30 and then fell back to 30.10. Was I filled at 30.30? The last question is the main.

PS First of all I'm interested how this order type behaves in IB.
 
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