Riddle: A horse travels a certain distance each day. Strangely enough, two of its legs travel 30 miles each day and the other two legs travel nearly 31 miles. It would seem that two of the horse's legs must be one mile ahead of the other two legs, but of course this can't be true, since the horse is normal. How is this possible?
Answer: The horse operates a mill and travels in a circular clockwise direction. The two outside legs will travel a greater distance than the two inside legs.