Here is a puzzler that recently came up on Car Talk:

A man and a woman go for a walk. During the entire duration of that walk, they walk side by side, never further than a foot apart from each other. None of them ever gets ahead of the other.
When the walk is over, the woman says “I walked four miles”. The man says “I walked five miles”.

The Car Talk guys gave one solution and I came up with two additional ones.

Can you find them? And maybe new ones?