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On a certain day it took Bill three times as long to drive
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Updated on: 26 Sep 2016, 07:40

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E

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45% (medium)

Question Stats:

68% (01:29) correct 32% (01:40) wrong based on 408 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 \(\frac{(distance-driven- from -home- to- work)}{(time- to- drive -from- home- to- work)}\) 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\(64\) kilometers per hour

Re: On a certain day it took Bill three times as long to drive
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15 Dec 2009, 03:22

1

1

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.

Schools: LBS, INSEAD, IMD, ISB - Anything with just 1 yr program.

Re: On a certain day it took Bill three times as long to drive
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15 Dec 2009, 06:37

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.
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Re: On a certain day it took Bill three times as long to drive
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15 Dec 2009, 07:19

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
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15 Dec 2009, 07:45

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
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26 Sep 2013, 07:10

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

Re: On a certain day it took Bill three times as long to drive
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26 Sep 2013, 07:35

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!

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