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GRE Math Challenge #33-constant rate of r miles per hour

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GRE Math Challenge #33-constant rate of r miles per hour [#permalink] New post 07 Sep 2014, 06:48
Expert's post
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Question Stats:

68% (00:14) correct 31% (01:12) wrong based on 16 sessions
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
[Reveal] Spoiler: OA

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Re: GRE Math Challenge #33-constant rate of r miles per hour [#permalink] New post 23 Jul 2018, 17:29
Expert's post
sandy wrote:
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3


We use the formula: distance = rate x time. Since 20 minutes = ⅓ hours, Stan went r x 1/3 = r/3 miles.

Answer: E
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Re: GRE Math Challenge #33-constant rate of r miles per hour   [#permalink] 23 Jul 2018, 17:29
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GRE Math Challenge #33-constant rate of r miles per hour

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