Betting

There were two guys sitting in a plane. The one guy says lets play a game, I'll ask you a question if you get it right I give you 5 dollars.So the other guy says fine if you get it right, I give you 50 dollars, if you get it wrong you give me5.The guy says ok.He asks him what his name was the guy didn't know it so he payed him 5 dollars.So the other guy asks what goes up a hill with 3 legs and comes down with4.He thinks and thinks but doesn't know so he pays him 50 dollars.He asks what does go up ahill with 3 legs and comes down with4.The guy hands him 5 dollars.