When I was at school in England, there was fresh bread every morning. I would eat it toasted or not, but usually with butter. Fresh bread is a pretty basic thing, but it was really good. Of course, I wasn't eating anything terribly exciting at school, just the usual cafeteria fare. In fact, on Wednesdays they would serve a few pieces of cheesy toast and some soup (basically hot water that had touched some vegetables at some point. I started referring to Wednesday as "Starvation Day".
But yesterday, I was enjoying a well-buttered piece of toast, and I remembered this really tasty bread. I enjoy appreciating simple things like this. It's not something I do often enough. Something simple, basic, fresh, and directly connnected to the basic senses (taste and smell, mostly).
So, here's the solution to the puzzle. All answers are correct. (Doesn't that make you feel like you're in Poetry class, rather than Math class?). If you put the dog in any position (between the boy and the girl, that is), facing either direction, you can then track his path backwards in time (rewinding the video, as it were), and, lo and behold, at time zero there they all are, boy, girl, and dog, at the same starting spot. Therefore, the position that you chose for 10 minutes later, or, in fact, any time t later, is correct. Regardless of which position you choose.
I'll smack anyone who says the phrase "outside of the box" right now.
If the answer above doesn't satisfy you, ask your local mathematician to look at it. Now, mathematicians aren't really all in agreement, some think that it doesn't make sense at all to talk about what happens at time 0, but that's just the way some mathematicians are.
