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On a certain day it took Bill three times as long to drive

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Manager
Joined: 31 Oct 2007
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Location: Frankfurt, Germany
On a certain day it took Bill three times as long to drive [#permalink]

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22 Mar 2008, 00:33
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Difficulty:

55% (hard)

Question Stats:

62% (01:44) correct 38% (02:13) wrong based on 100 sessions

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On a certain day it took Bill three times as long to drive from home to work as it took Sue to drive from home to work. How many kilometers did Bill drive from home to work?

(1) Sue drove 10 kilometers from home to work, and the ratio of distance driven from home to work time to drive from home to work was the same for Bill and Sue that day.

(2) The ratio of distance driven from home to work time to drive from home to work for Sue that day was 64 kilometers per hour

OPEN DISCUSSION OF THIS QUESTION IS HERE: on-a-certain-day-it-took-bill-three-times-as-long-to-drive-87986.html
[Reveal] Spoiler: OA

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Jimmy Low, Frankfurt, Germany
Blog: http://mytrainmaster.wordpress.com
GMAT Malaysia: http://gmatmalaysia.blogspot.com

Last edited by Bunuel on 27 May 2014, 10:22, edited 1 time in total.
Edited the question and added the OA

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Director
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Re: 1000DS: Section 1 Question 15 [#permalink]

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22 Mar 2008, 07:00
Folks , can anyone explain "ratio of distance driven from home to work time"? I don't understand it
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Re: 1000DS: Section 1 Question 15 [#permalink]

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22 Mar 2008, 07:13
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Question tells us if Sue took t hours to reach office, then Bill took 3t hours.

Statement 1:
Tells us that Sue travelled = 10 KM and ratio of distance driven from home to work time (Basically the speed) is same for both Sue and Bill.
Sue's speed = 10/t
Bill's Speed = D/3t (assuming Bill travelled D KM).
So as per this statement 10/t = D/3t => D = 30 KM
Question can be answered with this statement alone. Answer can only be A, or D.

Statement 2:
Tells us that Sue's speed = 64 KM/Hour. But no relation is given between Sue's speed and Bill's speed so this statement alone is insufficient.

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Director
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Re: 1000DS: Section 1 Question 15 [#permalink]

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22 Mar 2008, 07:15
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prasannar wrote:
Folks , can anyone explain "ratio of distance driven from home to work time"? I don't understand it

Ratio of Distance to time is basically Speed.

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Manager
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Re: 1000DS: Section 1 Question 15 [#permalink]

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22 Mar 2008, 07:57
Thks Jit.

The OA = A. I did not understand the underlined statement. Thks again.
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GMAT Malaysia: http://gmatmalaysia.blogspot.com

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Re: 1000DS: Section 1 Question 15 [#permalink]

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22 Mar 2008, 11:30
abhijit_sen, thanx, I'm also confused by the wording of the problem
+1
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Re: On a certain day it took Bill three times as long to drive [#permalink]

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27 May 2014, 08:18
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: On a certain day it took Bill three times as long to drive [#permalink]

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27 May 2014, 10:24
On a certain day it took Bill three times as long to drive from home to work as it took Sue to drive from home to work. How many kilometers did Bill drive from home to work?

{Bill's Time} = 3*{Sue's Time}

(1) Sue drove 10 kilometers from home to work, and the ratio of distance driven from home to work time to drive from home to work was the same for Bill and Sue that day.

Sue's distance = 10km,

The ratio of distance to time is rate of speed, so we are told that Bill's speed is the same as Sue's. As Bill's time was three times longer, with the same rate he would cover 3 times more distance than Sue did.

{Bill's distance} = 3*{Sue's distance} = 3*10 = 30km.

Sufficient.

(2) (2) The ratio of distance driven from home to work time to drive from home to work for Sue that day was 64 kilometers per hour. Only rate of Sue is given. Not sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: on-a-certain-day-it-took-bill-three-times-as-long-to-drive-87986.html
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Re: On a certain day it took Bill three times as long to drive   [#permalink] 27 May 2014, 10:24
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