I landed on the island of Knights and Knaves. There are only 2 types of people on the island, knights who always tell the truth and knaves who always lie. There are 2 leaders of the entire island, Raymond and Martin. Note that Raymond and Martin can both be knights, both be knaves or it can be that one is a knight and one is a knave.
I found them both at the same time, one in a Red hat and one in a Blue hat but I was not sure of who was who.
I asked both of them: "Is Raymond a Knight?" Only the one with the blue hat answered, and I can't remember what he said. But I do remember that at that point I was able to tell who was Raymond and who was Martin.
What color was Raymond's Hat?