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the energy used per meter during running is twice the energy

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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the energy used per meter during running is twice the energy [#permalink] New post 18 Jan 2016, 02:05
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If s is a speed, in miles per hour, at which the energy used per meter during running is twice the energy used per meter during walking, then, according
to the graph above, s is between

A 2.5 and 3.0
B 3.0 and 3.5
C 3.5 and 4.0
D 4.0 and 4.5
E 4.5 and 5.0

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Question: 21
Page: 335
Difficulty: medium



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[Reveal] Spoiler: OA

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Sandy
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1657 [0], given: 396

CAT Tests
Re: the energy used per meter during running is twice the energy [#permalink] New post 18 Jan 2016, 04:17
Expert's post
Solution

This question is about the speed at which the energy used per meter during running is twice that used per meter during walking. Graphically, this is the
speed for which the running energy is twice as high as the walking energy.

Looking at the graph, we can see that for speeds greater than or equal to 3.0 miles per hour, the running energy is less than twice the walking energy, so the desired speed must be less than 3.0. In fact, the desired speed is between 2.0 (the lowest speed on the graph) and 3.0. Looking at the answer choices, we see that there is only one answer choice that is between 2.0 and 3.0; namely, Choice A,which says the desired speed is between 2.5 and 3.0. The correct answer is Choice A.
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Sandy
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Re: the energy used per meter during running is twice the energy   [#permalink] 18 Jan 2016, 04:17
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the energy used per meter during running is twice the energy

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