Mr. Garrison has two dogs, Spot and Wolf. He enters them in a local dog race, which is 3,000 meters long. If Spot has an average speed of 500 meters per minute, and Wolf has an average speed of 200 meters per minute, how much longer does it take Wolf to run the race than Spot?
8.5 minutes
9.5 minutes
9 minutes
10 minutes
help!