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sanalnnair
- Senior | Next Rank: 100 Posts
- Posts: 42
- Joined: Wed Aug 04, 2010 11:20 am
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/hr, and his average speed for the remainder of the trip was 60miles 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??
1) 8.5%
2) 50%
3) x/12 %
4) 60/x %
5) 500/x %
Source - GMAT Prep.
I don't know the answer.
Please explain the steps needed to solve this question.
In this question I had solved it as, since 5miles he traveled in 30 miles/hr, therefore his time was 1 / 6 hr.
Again he traveled remaining (x-5) miles in 60 miles/hr. Then his time is (x-5) / 60
Then I had added (x-5) / 60 and 1/6 and then subtracted it from x/60 to find out the percent change. But I am not getting the answer.
Please help
1) 8.5%
2) 50%
3) x/12 %
4) 60/x %
5) 500/x %
Source - GMAT Prep.
I don't know the answer.
Please explain the steps needed to solve this question.
In this question I had solved it as, since 5miles he traveled in 30 miles/hr, therefore his time was 1 / 6 hr.
Again he traveled remaining (x-5) miles in 60 miles/hr. Then his time is (x-5) / 60
Then I had added (x-5) / 60 and 1/6 and then subtracted it from x/60 to find out the percent change. But I am not getting the answer.
Please help
