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During a trip on an expressway, Don drove a total of x

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During a trip on an expressway, Don drove a total of x [#permalink] New post 20 Apr 2006, 20:54
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. x/12%

d. 60/x%

e. 500/x%
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Re: Expressway [#permalink] New post 20 Apr 2006, 21:05
jlui4477 wrote:
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. x/12%

d. 60/x%

e. 500/x%


I would say E.

T1 = (x-5)/60 + 5/30
T2 = X/60

T1/T2 - 1 = 5/X
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 [#permalink] New post 20 Apr 2006, 21:43
Agree with E.

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! [#permalink] New post 14 Aug 2006, 08:28
:oops:
!   [#permalink] 14 Aug 2006, 08:28
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