PP-T2-PS110

[Huang Hsin-Yi]

110. 11325-!-item-!-187;#058&008034
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 the x-mile trip was what percent greater than it would have been if he had traveled at a constant rate of 60 miles per hour for the entire trip?

(A) 8.5%
(B) 50%
(C)
(D)
(E)

Ans:500%

[小花]

請參考這兒:
http://www.formosamba.com/phpBB3/viewtopi ... +Don+drove

[Huang Hsin-Yi]

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