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Two accountants, Rhodes and Smith, went to a business meeting together

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Two accountants, Rhodes and Smith, went to a business meeting together  [#permalink]

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New post 08 Jul 2018, 23:35
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  25% (medium)

Question Stats:

71% (00:45) correct 29% (00:38) wrong based on 94 sessions

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Project DS Butler: Day 32: Data Sufficiency (DS63)


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Two accountants, Rhodes and Smith, went to a business meeting together. Rhodes drove to the meeting, and Smith drove back from the meeting. If Rhodes and Smith each drove 140 kilometers, what was the average speed, in kilometers per hour, at which Rhodes drove?

(1) The average speed at which Smith drove was 70 kilometers per hour.

(2) Rhodes drove for exactly 2 hours.

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Re: Two accountants, Rhodes and Smith, went to a business meeting together  [#permalink]

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New post 09 Jul 2018, 01:11
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Bunuel wrote:
Two accountants, Rhodes and Smith, went to a business meeting together. Rhodes drove to the meeting, and Smith drove back from the meeting. If Rhodes and Smith each drove 140 kilometers, what was the average speed, in kilometers per hour, at which Rhodes drove?

(1) The average speed at which Smith drove was 70 kilometers per hour.

(2) Rhodes drove for exactly 2 hours.


Since we know that Rhodes drove 140 km, to know his average speed, we need to know his time.
We'll look for statements that give us this information, a Logical approach.

(1) This does not give us the time Rhodes drove.
Insufficient.

(2) this is exactly what we need!
Sufficient

(B) is our answer.
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Re: Two accountants, Rhodes and Smith, went to a business meeting together  [#permalink]

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New post 09 Jul 2018, 10:15
Bunuel wrote:
Two accountants, Rhodes and Smith, went to a business meeting together. Rhodes drove to the meeting, and Smith drove back from the meeting. If Rhodes and Smith each drove 140 kilometers, what was the average speed, in kilometers per hour, at which Rhodes drove?

(1) The average speed at which Smith drove was 70 kilometers per hour.

(2) Rhodes drove for exactly 2 hours.



Statement 1: From this we can find time taken for Smith to drive the distance. However tells us nothing about Rhodes.

Statement 1 is Not Sufficient.


Statement 2: Using this we can find average speed at which Rhodes drove.

Statement 2 is Sufficient.


Answer B.



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GyM
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Re: Two accountants, Rhodes and Smith, went to a business meeting together &nbs [#permalink] 09 Jul 2018, 10:15
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Two accountants, Rhodes and Smith, went to a business meeting together

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