Since this is a ridiculous question that I really don't want to wrap my head around right now, I'll respond with an even more ridiculous answer.
The Great Flying Spaghetti Monster plucked forth from his saucy heaven both a chicken and an egg. After not being able to decide between an omelet or nuggets, he unceremoniously threw the chicken and egg over His Great Meatbally Shoulder. The chicken and the egg both landed on Earth at exactly the same time, thus this argument is moot because they were here together all along.