Julie went on a trip of 480 miles. For the return trip, she realized that if she traveled at an average of 20 mph faster, then she would have arrived 2 hours sooner. How fast did she average going on her road trip?

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Julie went on a trip of 480 miles. For the return trip, she realized that if she traveled at an average of 20 mph faster, then she would have arrived 2 hours sooner. How fast did she average going on her road trip?