You are on a plane trying to escape from the island that onl

You are on a plane trying to escape from the island that only contains knights and knaves. You know knights always speak the truth and knaves always lie. As the cabin door shuts the pilot and the co-pilot walk down the aisle. And you guessed it… They are natives of the island!! They stop at your seat and…

The pilot says, “The co-pilot is a knave.”

The co-pilot says, “The pilot is a knave.”

As they walk away they both turn around and say, “Thank you for flying K & K Airlines.” What are the pilot and the co-pilot as in are they knights or knaves, one of each? Justify your answer.

Solution

They both cannot be either Knight or Knave.

So one of them is Knave and other is Knight.

as both say Thank you for flying K & K Airlines one means Knight and Knave Airlines other Knight and Knight