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James decides to walk from school to the park to play ball. The park is only 0.5 mile from the school. He leaves school at 3:15 and arrives at the parK 3:25. At what rate is James traveling?
A) 1 mile/10 minutes
B) 1 mile/15 minutes
C) 1 mile/20 minutes
D) 1 mile/30 minutes