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The total stopping distance for the car traveling at 60 mile

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The total stopping distance for the car traveling at 60 mile [#permalink] New post 19 Jan 2016, 15:00
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Question Stats:

75% (00:51) correct 25% (01:39) wrong based on 12 sessions
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The total stopping distance for the car traveling at 60 miles per hour is approximately what percent greater than the total stopping distance for the car traveling at 50 miles per hour?

 A 22%
 B 30%
 C 38%
 D 45%
 E 52%

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Question: 20
Page: 343
Difficulty: medium
[Reveal] Spoiler: OA

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Moderator
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User avatar
Joined: 18 Apr 2015
Posts: 5150
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Kudos [?]: 1030 [0], given: 4640

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Re: The total stopping distance for the car traveling at 60 mile [#permalink] New post 19 Jan 2016, 15:09
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Solution

The question seems at glance convoluted but is a simple % change. A ratio, actually

Using both graphs, you do need to find the total stopping distance at 50 miles per hour and at 60 miles per hour, find their difference, and then express the difference as a percent of the shorter total stopping distance. At 50 miles per hour, the total stopping distance is approximately 55+137=192 feet; and at 60 miles per hour it is approximately 66+198=264 feet. The difference of 72 feet as a percent of 192 feet is \(\frac{72}{192}=0.37\) or approximately 38%.

The correct answer is \(C.\)
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Re: The total stopping distance for the car traveling at 60 mile   [#permalink] 19 Jan 2016, 15:09
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The total stopping distance for the car traveling at 60 mile

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