Has to be a trick question. They each have the King high straight showing. It would seem that it has to be Q - 4, but I'm sure I'm missing something. Do they extend the straight here? 7 - 8 has the longest continuous straight, but I've never heard of that rule in poker. Since it's a tie, do they do that? I honestly don't know.
As I understand, it is a tie. You can only use 5 cards. And the best 5 cards are on the board. Others?