Friend Riddles

The Impostor
Riddle:
There are two people in front of you holding guns. One is your best friend and the other is an impostor who looks just like him and knows all that he knows. You also have a gun and must shoot the impostor, if you get it wrong, the impostor will shoot you. If you get it right you and your friend are safe. What is the one question you can ask that will reveal the impostor?
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My Wall Clock
Riddle:
I have a clock in my house, on the wall. On a summer's day I forgot to wind it and it stopped. Then I went to visit a friend who had a watch that was always right on time. After I stayed for a bit, I went home, made a simple alteration and set the clock just right. Now how did I do this when I had no watch on me to tell how long it took me to come back from my friend's place?
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The Bus Stop
Riddle:
You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus: 1. An old lady who looks as if she is about to die. 2. An old friend who once saved your life. 3. The perfect partner you have been dreaming about. Knowing that there can only be one passenger in the car, who would you choose?
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