Round 659!

Bubba invited Beavis and Butthead to his house for a barbeque. Since Bubba's barbeque is only capable of handling two hamburgers at once, he wonders how he can cook three hamburgers at once, he wonders how he can cook three hamburgers in the shortest amount of time. It takes five minutes fro each side of a burger to cook. Therefore, in ten minutes two will be cooked, and another ten minutes will be needed to cook the third burger. Butthead says all three can be cooked i just 15 minutes. How?

cook burgers 1 and 2 on one side each for 5 mins
take burger 1 off
flip burger 2 add burger 3 and cook for 5 more mins
then remove burger 2 it's done
finish burger 1 and 3 for the final 5 mins
[ Winner is partimeninjainc ]