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

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15 Dec 2009, 00:04

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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

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

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15 Dec 2009, 04:22

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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?

{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.

(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.

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

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15 Dec 2009, 07:37

Bunuel wrote:

Stem: Bill's Time =3* Sue's Time.

I am an Indian born, supposedly these kinda problems are my bread and butter, but apparently I make such silly mistakes, I read the stem as - Bill's driving distance = 3 * Sue's driving distance.

Anyhow, A is the answer but, I can't get lucky with every other problem. _________________

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

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15 Dec 2009, 08:19

thank you Bunuel....but am I wrong to assume that they may have driven the same distance, however, Bill just took a longer time?! That was why I got stuck in asnwering the question. ANy advice you offer will be appreciated.

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

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15 Dec 2009, 08:45

Expert's post

dobinnoli wrote:

thank you Bunuel....but am I wrong to assume that they may have driven the same distance, however, Bill just took a longer time?! That was why I got stuck in asnwering the question. ANy advice you offer will be appreciated.

Let's do this algebraically:

Bill's Time =3* Sue's Time --> \(Bt=3*St\)

(1) Sue's distance 10km --> \(Sd=10\)

\(\frac{Sd}{St}=\frac{Bd}{Bt}\) -->

\(\frac{10}{St}=\frac{Bd}{3*St}\) -->

\(Bd=30\)

As for your question: statement 1 tells us that Bill's and Sue's rates are the same, and Bill spent 3 times more time to cover his distance. Obviously distances can not be the same if rates are same and time are not as Distance=Time*Rate.

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

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26 Sep 2013, 08:10

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 \(\frac{Distance driven from home to work}{time to drive from home to work}\) was the same for bill and sue that day

2) the ratio of \(\frac{Distance driven from home to work}{time to drive from home to work}\) for sue that day was 64 kilometres per hour

Please provide detailed explanations! _________________

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

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26 Sep 2013, 08:35

Expert's post

fozzzy wrote:

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 \(\frac{Distance driven from home to work}{time to drive from home to work}\) was the same for bill and sue that day

2) the ratio of \(\frac{Distance driven from home to work}{time to drive from home to work}\) for sue that day was 64 kilometres per hour

Please provide detailed explanations!

Merging similar topics. Please search before posting. _________________

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

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26 Nov 2014, 03:09

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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

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