Logic Riddles

Question: You are in a car with your friend and your car ran out of gas. You went to the gas station to go pick up some gas. You told your friend to close all the windows and don't turn the radio on. Your friend turned the radio on and the radio was the news reporting there is a murderer in town. Your friend looked up and saw the murderer. The murderer killed your friend. How is this possible?

Question: Insects have been disappearing for the past month. You are in a lab studying why and how this is happening, but the main door closes and you are locked inside. There are three doors in front of you that lead to freedom. Door 1: Hungry eating plants Door 2: Blood-thirsty vampires Door 3: Coldwater which you would get hypothermia quickly. Which door would you choose?

Question: Mary was driving home from the countryside. She stopped by a grocery store to get some food. When she walked out of the store, her car was gone. She called the police right away. The police found her car near the bank and held three suspects. Suspect 1: A chubby man with fitness clothes on. Suspect 2: A woman with money in her hand. Suspect 3: A man with dirt on his pants.

Question: The police found a lost kid. He is too young to talk and can't say where his parents are. Three people came claiming they were the kid's parent. They were allowed to spend 2 minutes alone with the boy. The policemen were watching them through the window. Claiming parent 1: A woman with chocolate, a burger, and fries feeding the little kid. Claiming parent 2: "Where were you, I have been looking for you everywhere!?" Claiming parent 3: "Look it's your favorite car!" Who is the criminal?

Question: There're two people in front of you: your friend and an imposter looking exactly like your friend. There's no way to determine who is who by asking questions, they know the same information about you. You have only one bullet in your gun. If you kill or injure the imposter, you and your friend will be saved, If you're wrong, he'll kill you immediately. How will you know?