500
REFER TO GOOGLE DOC
Sample: Luis is trying to get home. He starts 2 miles from his home, then sees a bear and runs away at 4 mph until he is 10 miles from his house, where he loses the bear and rests for 2 hours. He then turns around and walks home at 1.5 mph, sees the bear after 4 hours of walking, and runs home for an hour at 4 mph.