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Yesterday it took a certain plane 3 hours to fly from City A [#permalink]
19 Nov 2008, 19:42
Yesterday it took a certain plane 3 hours to fly from City A to City B at an average speed of 400 miles per hour. Today the same plane flew from City A to City B along the same route at an average speed of 450 miles per hour. How many more yesterday than it took today? A. 10 B. 15 C. 20 D. 25 E. 30