You are in trapped in a room that has two doors. One is an exit and the other has hungry lion behind it. There two people in the room with you. The first is a nice man who always tells the truth and the other is a second hand car salesman who always lies. Both of these people know what is behind each door, but you do not know who is the nice guy and who would sell you a junk car.
You may ask one of the men just one question.
What should you ask in order to escape the room and avoid the hungry lion?
As ever, please do not post your answers, but feel free to say if you solved it and how long it took. Answer on Monday.