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Reid took 1 hour to cycle from his home to his college

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Reid took 1 hour to cycle from his home to his college [#permalink] New post 27 Jan 2012, 11:28
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Difficulty:

  55% (hard)

Question Stats:

57% (05:04) correct 43% (01:40) wrong based on 7 sessions
Attachment:
Distance.JPG
Distance.JPG [ 32.16 KiB | Viewed 2360 times ]

Reid took 1 hour to cycle from his home to his college. The graph shows Reed’s distance from his college during That hour. Reid’s average speed for the last 15 minutes Of the hour was how many kifometers per hour greater Than his average speed for the first 45 minutes?

A. 3
B. 4
C. 5
D. 6
E. 7
[Reveal] Spoiler: OA

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Re: Reid took 1 hour to cycle from his home to his college [#permalink] New post 28 Jan 2012, 05:22
Expert's post
Baten80 wrote:
Attachment:
Distance.JPG

Reid took 1 hour to cycle from his home to his college. The graph shows Reed’s distance from his college during That hour. Reid’s average speed for the last 15 minutes Of the hour was how many kifometers per hour greater Than his average speed for the first 45 minutes?

A. 3
B. 4
C. 5
D. 6
E. 7


There must be something wrong with the image: it's hard to identify which number corresponds to which mark on the graph.

Anyway the solution should be as follows: {average rate for the last 15 minutes}-{average rate for the first 45 minutes}={distance covered in the last 15 minutes}/(1/4)-{distance covered in the first 45 minutes}/(3/4).
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Re: Reid took 1 hour to cycle from his home to his college   [#permalink] 28 Jan 2012, 05:22
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Reid took 1 hour to cycle from his home to his college

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