One party puzzle from everyday life.
Steaks
It takes 10 minutes to fry one steak - 5 minutes from each side. Two steaks can fit on a pan. What is the shortest possible time to fry 3 steaks?
Hint
You can start frying a steak take it off the pan and finish it later.
Answer
In 15 minutes. After five minutes you take one steak off and turn the other. After 10 minutes one steak is ready and the other two need to be finished from second side.