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The time it took car A to travel 400 miles was 2 hours less [#permalink]
13 May 2005, 11:22
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The time it took car A to travel 400 miles was 2 hours less than the time it took car B to travel the same distance. If car A's average speed was 10 miles per hour greater than that of car B, what was car B's average speed, in miles per hour?