Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Aug 2014, 08:50

Flash Sale:

The Economist GMAT Tutor - 15% Off All Courses


Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

M04 #1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 10 Sep 2008
Posts: 38
Followers: 1

Kudos [?]: 22 [0], given: 0

M04 #1 [#permalink] New post 22 Sep 2008, 18:48
Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

1) It took Bill 15 more minutes to drive to school today than usually
2) The distance between home and school is 15 miles

[Reveal] Spoiler: OA
A

Source: GMAT Club Tests - hardest GMAT questions

S1 tells us that on average Bill drives for 15 minutes less. Since he drove 1.5 times slower, the 15 minutes account for the difference. Therefore, it is possible to find the difference. (Can Someone Please Explain to Me Here In an Equation HOw we Can come up with that Answer if We Needed To. Thank you.

S2 does not tell us much; we don't really need to know the distance and by itself it is insufficeint.

REVISED VERSION OF THIS QUESTION IS HERE: m04-70604-20.html#p1121614
Kaplan Promo CodeKnewton GMAT Discount CodesManhattan GMAT Discount Codes
2 KUDOS received
Intern
Intern
User avatar
Joined: 17 Sep 2008
Posts: 6
Schools: Chicago Booth, Wharton, MIT, Haas
Followers: 0

Kudos [?]: 7 [2] , given: 0

Re: M04 #1 [#permalink] New post 23 Sep 2008, 14:33
2
This post received
KUDOS
Let d be the distance, and v the uniform speed of travel. Then,

d/(v/1.5) - d/v = 15 min

You're looking for (d/v), which is 30 mins.
2 KUDOS received
Intern
Intern
avatar
Joined: 04 Feb 2009
Posts: 7
Followers: 0

Kudos [?]: 2 [2] , given: 1

Re: M04 #1 [#permalink] New post 11 Jan 2010, 09:37
2
This post received
KUDOS
Distance=Speed*time
Here distance is constant, so
Original Speed*Original time=New Speed*New time
Acc. to stmt 1
s*t=(s/1.5)*(t+15)
1.5t= t+15
0.5t=15
t=30 min.

Hope this helps.
1 KUDOS received
Manager
Manager
avatar
Joined: 29 Jun 2009
Posts: 52
Followers: 0

Kudos [?]: 7 [1] , given: 4

Re: M04 #1 [#permalink] New post 11 Jan 2010, 10:11
1
This post received
KUDOS
Ouch!! It is the first time I am hearing the phrase "times slower", in this case "1.5 times slower". I am not sure if this automatically means Velocity/1.5 just as"1.5 times faster" would mean Velocity*1.5. Can someone clarify this ? This seems pretty basic but I have difficulty with it.

Thanks
Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19030
Followers: 3361

Kudos [?]: 24373 [1] , given: 2677

Re: M04 #1 [#permalink] New post 14 Sep 2012, 11:10
1
This post received
KUDOS
Expert's post
dczuchta wrote:
Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

1) It took Bill 15 more minutes to drive to school today than usually
2) The distance between home and school is 15 miles

[Reveal] Spoiler: OA
A

Source: GMAT Club Tests - hardest GMAT questions

S1 tells us that on average Bill drives for 15 minutes less. Since he drove 1.5 times slower, the 15 minutes account for the difference. Therefore, it is possible to find the difference. (Can Someone Please Explain to Me Here In an Equation HOw we Can come up with that Answer if We Needed To. Thank you.

S2 does not tell us much; we don't really need to know the distance and by itself it is insufficeint.


BELOW IS REVISED VERSION OF THIS QUESTION:

On Tuesday it took Bill 1.5 times as long to drive from home to school as it took him the day before on Monday. How long did it take Bill to drive from home to school on Monday? (Assume that each day Bill takes the same route).

(1) On Tuesday it took Bill 15 minutes longer to drive from home to school than on Monday.
(2) The distance between home and school is 15 miles.

Suppose it took Bill t minutes to drive from home to school on Monday, then on Tuesday, it would took him 1.5t minutes.

(1) On Tuesday it took Bill 15 minutes longer to drive from home to school than on Monday --> 1.5t=t+15 --> t=30 minutes. Sufficient.

(2) The distance between home and school is 15 miles. Useless info. Not sufficient.

Answer: A.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

1 KUDOS received
BSchool Forum Moderator
avatar
Joined: 13 Dec 2012
Posts: 215
Followers: 5

Kudos [?]: 89 [1] , given: 29

Premium Member
Re: M04 #1 [#permalink] New post 18 Jan 2013, 05:36
1
This post received
KUDOS
dczuchta wrote:
Driving 1.5 times slower, Bill was late for school today. What is the usual time it takes Bill to drive to school? (Assume that each day Bill takes the same route).

1) It took Bill 15 more minutes to drive to school today than usually
2) The distance between home and school is 15 miles

[Reveal] Spoiler: OA
A

Source: GMAT Club Tests - hardest GMAT questions

S1 tells us that on average Bill drives for 15 minutes less. Since he drove 1.5 times slower, the 15 minutes account for the difference. Therefore, it is possible to find the difference. (Can Someone Please Explain to Me Here In an Equation HOw we Can come up with that Answer if We Needed To. Thank you.

S2 does not tell us much; we don't really need to know the distance and by itself it is insufficeint.

REVISED VERSION OF THIS QUESTION IS HERE: m04-70604-20.html#p1121614


When I saw this question today, I knew there was something wrong with it. How can you drive 1.5 times slower? That is 150% slower and more like a negative movement. The revised version makes more sense.
_________________

Blog: The MBA Journey of an African Doctor

Blog updated: July 27, 2014

Director
Director
User avatar
Joined: 25 Oct 2008
Posts: 611
Location: Kolkata,India
Followers: 8

Kudos [?]: 158 [0], given: 100

GMAT Tests User
Re: M04 #1 [#permalink] New post 02 Sep 2009, 00:59
Quote:
S1 tells us that on average Bill drives for 15 minutes less. Since he drove 1.5 times slower, the 15 minutes account for the difference


Guys I dont understand how stmt 1 is suff..don't we have two variables?Distance and speed?
Somebody please explain in detail..
_________________

countdown-beginshas-ended-85483-40.html#p649902

CIO
CIO
avatar
Joined: 02 Oct 2007
Posts: 1218
Followers: 87

Kudos [?]: 650 [0], given: 334

GMAT ToolKit User GMAT Tests User
Re: M04 #1 [#permalink] New post 02 Sep 2009, 01:16
While d is distance and v is speed, \frac{d}{v} is time. So you end up with a "single variable" \frac{d}{v}.

Hope it helped.
tejal777 wrote:
Quote:
S1 tells us that on average Bill drives for 15 minutes less. Since he drove 1.5 times slower, the 15 minutes account for the difference


Guys I dont understand how stmt 1 is suff..don't we have two variables?Distance and speed?
Somebody please explain in detail..

_________________

Welcome to GMAT Club! :)
Facebook TwitterGoogle+LinkedIn
Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Please read this before posting in GMAT Club Tests forum
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

Get the best GMAT Prep Resources with GMAT Club Premium Membership

CIO
CIO
avatar
Joined: 02 Oct 2007
Posts: 1218
Followers: 87

Kudos [?]: 650 [0], given: 334

GMAT ToolKit User GMAT Tests User
Re: M04 #1 [#permalink] New post 22 Sep 2009, 11:18
tejal777 wrote:
I get all the tougher questions of DTS but easy questions like these...ARRRGH..can somebody please form equations the OE is not clear:(

Will the one below suffice?
mmond4 wrote:
Let d be the distance, and v the uniform speed of travel. Then,

d/(v/1.5) - d/v = 15 min

You're looking for (d/v), which is 30 mins.

_________________

Welcome to GMAT Club! :)
Facebook TwitterGoogle+LinkedIn
Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Please read this before posting in GMAT Club Tests forum
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
User avatar
Joined: 06 Jan 2010
Posts: 20
Schools: Wake Forest Evening
WE 1: ~12 years total
Followers: 0

Kudos [?]: 2 [0], given: 33

Re: M04 #1 [#permalink] New post 11 Jan 2010, 09:04
A, Statement 1 only. You could figure out that 30 minutes is the regular time it takes to get to school.
Intern
Intern
avatar
Joined: 15 Nov 2009
Posts: 31
Location: Moscow, Russia
Followers: 0

Kudos [?]: 12 [0], given: 0

Re: M04 #1 [#permalink] New post 11 Jan 2010, 19:57
Almost the same solution we'll get if we denote the usual time by t and distance by d.
Then the equation looks like d/t=1.5d/(t+15), which doesn't depend on d and finally
t+15=1.5t. A is suff alone.
CIO
CIO
avatar
Joined: 02 Oct 2007
Posts: 1218
Followers: 87

Kudos [?]: 650 [0], given: 334

GMAT ToolKit User GMAT Tests User
Re: M04 #1 [#permalink] New post 12 Jan 2010, 05:55
Yes, you understood it correctly :).
kaptain wrote:
Ouch!! It is the first time I am hearing the phrase "times slower", in this case "1.5 times slower". I am not sure if this automatically means Velocity/1.5 just as"1.5 times faster" would mean Velocity*1.5. Can someone clarify this ? This seems pretty basic but I have difficulty with it.

Thanks

_________________

Welcome to GMAT Club! :)
Facebook TwitterGoogle+LinkedIn
Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Please read this before posting in GMAT Club Tests forum
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 29 Jun 2009
Posts: 52
Followers: 0

Kudos [?]: 7 [0], given: 4

Re: M04 #1 [#permalink] New post 12 Jan 2010, 23:00
dzyubam wrote:
Yes, you understood it correctly :).
kaptain wrote:
Ouch!! It is the first time I am hearing the phrase "times slower", in this case "1.5 times slower". I am not sure if this automatically means Velocity/1.5 just as"1.5 times faster" would mean Velocity*1.5. Can someone clarify this ? This seems pretty basic but I have difficulty with it.

Thanks


Thanks dzyubam.
I sometimes have problems with the language in the questions.Making an equation itself becomes hard. My english skills are't bad and I have gone through Manhattan Word Translations as well. Still there is a gap as long as interpreting the questions go. I get trapped in 600 level questions because of this. Any suggestions ?
Manager
Manager
avatar
Joined: 29 Jun 2009
Posts: 52
Followers: 0

Kudos [?]: 7 [0], given: 4

Re: M04 #1 [#permalink] New post 12 Jan 2010, 23:09
An example of the question type I just talked on is the one below. Took lots of time to formulate the equation. Picking numbers gets confusing as well:-

"I am twice as old as you were when I was as old as you are.The sum of the ages is 64.Find the ages"
CIO
CIO
avatar
Joined: 02 Oct 2007
Posts: 1218
Followers: 87

Kudos [?]: 650 [0], given: 334

GMAT ToolKit User GMAT Tests User
Re: M04 #1 [#permalink] New post 13 Jan 2010, 00:05
For a problem like this you might want to consider picking numbers instead of actually solving the problem. The wording of this problem is indeed tricky.

As for advice, please check out this thread if you haven't yet:
word-problems-made-easy-87346.html

It has a lot of good stuff there. Hope it helps :).
kaptain wrote:
An example of the question type I just talked on is the one below. Took lots of time to formulate the equation. Picking numbers gets confusing as well:-

"I am twice as old as you were when I was as old as you are.The sum of the ages is 64.Find the ages"

_________________

Welcome to GMAT Club! :)
Facebook TwitterGoogle+LinkedIn
Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Please read this before posting in GMAT Club Tests forum
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
avatar
Joined: 15 Nov 2009
Posts: 31
Location: Moscow, Russia
Followers: 0

Kudos [?]: 12 [0], given: 0

Re: M04 #1 [#permalink] New post 13 Jan 2010, 12:55
kaptain wrote:
An example of the question type I just talked on is the one below. Took lots of time to formulate the equation. Picking numbers gets confusing as well:-

"I am twice as old as you were when I was as old as you are.The sum of the ages is 64.Find the ages"


First, the sum S of the ages must divisible by 7.
If S=63 (instead of the given 64), the ages are 36 and 27 (9 years ago: 27 and 18).
if S=70, then 40 and 30 (30 and 20), if S=7 then 4 and 3.
If x and y are the ages, then till the difference between the ages x-y=y-x/2, or 3x=4y.
In general, the ages are 4S/7 and 3S/7. And the difference between the ages will be S/7. If S is not a multiple of 7 you'll get confusing fractions as ages.
Intern
Intern
avatar
Joined: 22 Dec 2010
Posts: 6
Followers: 0

Kudos [?]: 7 [0], given: 0

Re: M04 #1 [#permalink] New post 14 Jan 2011, 06:30
Let T(1) be the usual time
Let T(2) be todays time
then the problem reads:
T(2)=1,5 * T(1) Solve for T(1)
Data 1 reads:
T(2)=T (1)+15 min ==> 2 equations with 2 variables ==> sufficient
Data 2 reads:
Distance = 15 miles ==> no information about T(1) ==> not necessary and insufficient
Intern
Intern
avatar
Joined: 09 Jan 2011
Posts: 7
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: M04 #1 [#permalink] New post 14 Jan 2011, 07:16
Yups, Answer is A

d = distance
s = speed
t = time

d=st

We have following information on normal days Bill goes with '1.5s' and today he went with speed 's'

From 1st Clause we get additional info that on normal days Bill takes time 't' mins and today he took 't+15' mins

So we get,

d = (1.5s)(t)
d = (s)(t+15)

That gives ..

1.5st = st + 15s
0.5st = 15s
0.5t = 15 (cancelling out s, As s<>0)
t = 30 mins

From 1st Clause we can derive all things

From 2nd Clause,

We dont have any information about 'time taken' so cannot complete the formula..

So answer is 'A'
Manager
Manager
avatar
Joined: 23 Oct 2010
Posts: 87
Location: India
Followers: 3

Kudos [?]: 20 [0], given: 6

Re: M04 #1 [#permalink] New post 15 Jan 2011, 09:37
C

Let speed be B. New speed is B'
B= 1.5B'
t = ?
s1 x/B = x/B' + 15
=> x/1.5B' = x/B' + 15
two unkowns. Not suff
s2 x = 15
insuff

combine
15/1.5B' = 15/B' +15
suff

Posted from my mobile device Image
Manager
Manager
avatar
Joined: 23 Nov 2009
Posts: 90
Schools: Wharton..:)
Followers: 2

Kudos [?]: 31 [0], given: 14

GMAT Tests User
Re: M04 #1 [#permalink] New post 16 Jan 2011, 00:16
k..1.5 times slower means =
if original speed is 6x
then 1.5 times slower speed is =4x

a) t=d/s
so for original thing t= d/6x and with reduced speed t+15=d/4x
so one can calculate frm here two equations , two unknowns , and no quadratic so u have the ans!

B) how late u cannot say

ans A!
_________________

" What [i] do is not beyond anybody else's competence"- warren buffett
My Gmat experience -http://gmatclub.com/forum/gmat-710-q-47-v-41-tips-for-non-natives-107086.html

Re: M04 #1   [#permalink] 16 Jan 2011, 00:16
    Similar topics Author Replies Last post
Similar
Topics:
m04 bibha 1 12 Jul 2010, 03:49
3 Experts publish their posts in the topic m04 #24 gmat4life 24 09 Oct 2008, 14:47
15 Experts publish their posts in the topic M04 # 32 dczuchta 15 22 Sep 2008, 18:43
3 Experts publish their posts in the topic m04 Q23 vishy007 12 14 Sep 2008, 05:12
22 Experts publish their posts in the topic M04 #12 Tvisha 93 10 Aug 2008, 11:56
Display posts from previous: Sort by

M04 #1

  Question banks Downloads My Bookmarks Reviews Important topics  

Go to page    1   2    Next  [ 27 posts ] 

Moderators: Bunuel, WoundedTiger



GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.