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How many kilometers did Bill drive

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How many kilometers did Bill drive

by gmatnmein2010 » Fri Feb 19, 2010 7:55 pm
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
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by thephoenix » Fri Feb 19, 2010 9:33 pm
gmatnmein2010 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 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
IMO A
Bill's Time =3* Sue's Time

(1) 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) Only rate of Sue is given, not sufficient.
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by shashank.ism » Sun Feb 21, 2010 10:18 am
gmatnmein2010 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 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
tb = 3 ts
St.1) from home to work = 10 km for sue...
now ratio of distance driven from home to work time to drive from home to work was the same for Bill and Sue that day.
i.e speed of sue = speed of bill.
and tb = 3 ts
so db = 3 ds..
so db = 10 x3 =30km ===========suff..

St.2) speed of sue = 64 km/hr ..but that is not sufficient to calculate ..we also need the value of speed of Bill.=======.insuff..

Ans A
Last edited by shashank.ism on Sun Feb 21, 2010 11:09 am, edited 2 times in total.
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by ajith » Sun Feb 21, 2010 10:24 am
gmatnmein2010 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 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
1) Sufficient, it gives the ratio and the base. The distance Bill drove = 10*3 =30

2) Insufficient... The average speed will not do

I see a lot of copy pasting mistakes in here.... Must be a coincidence
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by shashank.ism » Sun Feb 21, 2010 11:11 am
ajith wrote:
gmatnmein2010 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 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
1) Sufficient, it gives the ratio and the base. The distance Bill drove = 10*3 =30

2) Insufficient... The average speed will not do

I see a lot of copy pasting mistakes in here.... Must be a coincidence
Ajith that is the use of Font size to put subscript for bill and sue tb and ts
t(size=9)b(/size) and t(size=9)s(/size)
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by ajith » Sun Feb 21, 2010 11:13 am
shashank.ism wrote: Ajith that is the use of Font size to put subscript for bill and sue tb and ts
t(size=9)b(/size) and t(size=9)s(/size)
I am not referring to that....I meant the original post
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by shashank.ism » Sun Feb 21, 2010 11:54 am
ajith wrote:
shashank.ism wrote: Ajith that is the use of Font size to put subscript for bill and sue tb and ts
t(size=9)b(/size) and t(size=9)s(/size)
I am not referring to that....I meant the original post
oh I thought u were taking about subscript thing...ok
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