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During a trip on an expressway, Don drove a total of x [#permalink]
22 May 2006, 14:01
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During a trip on an expressway, Don drove a total of x miles. His average speed on a certain 5-mile section of the expressway was 30 miles per hour, and his average speed for the remainder of the trip was 60 miles per hour. His travel time for x-mile trip was what percent greater than it would have if he had travelled at a constant rate of 60 miles per hours for the entire trip?