I suppose this one should not be very difficult for all you smart people out there, but anyways, let's see. This is about two brothers who together, run a phone booth at an intersection of two highways, one going to city A and the other going to city B. It is known about the brothers that the elder one always speaks the truth while the younger one always lies about anything you might ask him. A man going to City A came upto that intersection and now is not sure which of the two ways to take. He is aware of the strange habit of the brothers at the phone booth, and sees that one of them is at the booth. His problem is that he does know which of the brothers is at the shop at that moment. In order to ask about his way, he can just ask one question to that man. Find out which is that one question that he should ask so that he is certian to go the correct way. and remember, he can ask only one question.