ask one door "are you both lying" if it says yes, then that's the door of lies. if it says no, that's the door of truth. err, door of lies = city of lies door of truth = city of truth
You ask a a door - "If I were to ask the other door which door leads to the city of truth, what would he say". And then you pick the opposite door of what he tells you.
2 people have the right answer so far. All you have to ask is "if I asked the other door which door leads to the city of truth, what answer would he give me?" And yeah, this riddle is pretty old.
I knwo this one!!! You say this: "If I were to ask the other door which door leads to the city of truth, what would he say". And then you pick the opposite door of what he tells you."
Ask if doors can talk... haah since they can in this situation, the door of truth will say yes, and the liar wiill say no