In a group of five friends: Alice, Bob, Charlie, David, and Eva, the following conditions apply: Alice is not friends with Bob. Charlie is friends with both Alice and David. Bob is friends with Eva but not with David. Who can be selected as friends of Alice?
In a team of four: Tom, Jerry, Spike, and Tyke, the following rules apply: Tom cannot work with Jerry. Spike can work with either Tom or Jerry, but not both. Who can work together without violating the rules?
In a race, there are six participants: P, Q, R, S, T, and U. P finishes before Q but after R. S finishes before T but after U. Which participant finishes last?