Last visit was: 05 Dec 2024, 00:58 It is currently 05 Dec 2024, 00:58
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
NoHalfMeasures
User avatar
Retired Moderator
Joined: 29 Oct 2013
Last visit: 11 Jul 2023
Posts: 220
Own Kudos:
2,155
 [98]
Given Kudos: 204
Concentration: Finance
GPA: 3.7
WE:Corporate Finance (Retail Banking)
Posts: 220
Kudos: 2,155
 [98]
9
Kudos
Add Kudos
88
Bookmarks
Bookmark this Post
Most Helpful Reply
User avatar
balamoon
Joined: 26 Dec 2011
Last visit: 21 Jun 2019
Posts: 111
Own Kudos:
281
 [22]
Given Kudos: 91
Schools: HBS '18 IIMA
Schools: HBS '18 IIMA
Posts: 111
Kudos: 281
 [22]
15
Kudos
Add Kudos
7
Bookmarks
Bookmark this Post
General Discussion
User avatar
manpreetsingh86
Joined: 13 Jun 2013
Last visit: 19 Dec 2022
Posts: 222
Own Kudos:
1,099
 [4]
Given Kudos: 14
Posts: 222
Kudos: 1,099
 [4]
Kudos
Add Kudos
4
Bookmarks
Bookmark this Post
User avatar
ElCorazon
Joined: 02 Jan 2015
Last visit: 21 Sep 2016
Posts: 28
Own Kudos:
Given Kudos: 54
GMAT Date: 02-08-2015
GPA: 3.7
WE:Management Consulting (Consulting)
Products:
Posts: 28
Kudos: 52
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Is there a quicker way to see that the distance variable cancels out, rather than going through the entire algebraic calculation? I made the assumption that the variable would remain, and struggle to finish in ~ 2 minutes once I start getting into algebra for DS questions. Thanks..
User avatar
chetan2u
User avatar
RC & DI Moderator
Joined: 02 Aug 2009
Last visit: 21 Nov 2024
Posts: 11,445
Own Kudos:
37,831
 [4]
Given Kudos: 333
Status:Math and DI Expert
Products:
Expert reply
Posts: 11,445
Kudos: 37,831
 [4]
1
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
ElCorazon
Is there a quicker way to see that the distance variable cancels out, rather than going through the entire algebraic calculation? I made the assumption that the variable would remain, and struggle to finish in ~ 2 minutes once I start getting into algebra for DS questions. Thanks..

Hi ElCorazon,
the Q stem tells us the speed in two different routes and asks us the average speed..
for this we require the distance or the ratio of distances..
lets see the statement..
1)statement 1 gives us the ratio of distance .. so sufficient..
2) statement two tells us the ratio of time so multiplying this ratio with speed would give us the ratio of distance .. again sufficient

ans D
User avatar
EMPOWERgmatRichC
User avatar
GMAT Club Legend
Joined: 19 Dec 2014
Last visit: 31 Dec 2023
Posts: 21,808
Own Kudos:
12,034
 [11]
Given Kudos: 450
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Expert reply
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Posts: 21,808
Kudos: 12,034
 [11]
11
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi ElCorazon,

The 'goal' to try to answer each Quant question in under 2 minutes is NOT practical. While some questions can be solved relatively quickly (in under 30 seconds), certain questions are designed to take longer to solve (upwards of 3 minutes, and that's if you KNOW what you're doing). These types of "multi-step trip" questions are usually wordier, take more steps to solve and require a higher degree of organization and attention-to-detail than most prompts, so it's understandable that you would need MORE than 2 minutes to solve it.

Instead of having a "2 minutes or less" goal, focus more on your overall efficiency - you should try to get this question correct without wasting time.

GMAT assassins aren't born, they're made,
Rich
User avatar
Konstantin1983
Joined: 02 Dec 2014
Last visit: 08 Dec 2021
Posts: 304
Own Kudos:
Given Kudos: 353
Location: Russian Federation
Concentration: General Management, Economics
GMAT 1: 640 Q44 V33
WE:Sales (Telecommunications)
GMAT 1: 640 Q44 V33
Posts: 304
Kudos: 308
Kudos
Add Kudos
Bookmarks
Bookmark this Post
EMPOWERgmatRichC
Hi ElCorazon,

The 'goal' to try to answer each Quant question in under 2 minutes is NOT practical. While some questions can be solved relatively quickly (in under 30 seconds), certain questions are designed to take longer to solve (upwards of 3 minutes, and that's if you KNOW what you're doing). These types of "multi-step trip" questions are usually wordier, take more steps to solve and require a higher degree of organization and attention-to-detail than most prompts, so it's understandable that you would need MORE than 2 minutes to solve it.

Instead of having a "2 minutes or less" goal, focus more on your overall efficiency - you should try to get this question correct without wasting time.

GMAT assassins aren't born, they're made,
Rich
Hi Rich!
I watched EMPOWERGmat course and you said that if we have a ratios that means that statement is sufficient. Hence answer is D. Do i think logically?=))
User avatar
VeritasPrepBrandon
User avatar
Veritas Prep GMAT Instructor
Joined: 23 Oct 2013
Last visit: 07 Jun 2016
Posts: 143
Own Kudos:
897
 [3]
Given Kudos: 9
Expert reply
Posts: 143
Kudos: 897
 [3]
3
Kudos
Add Kudos
Bookmarks
Bookmark this Post
This question is not correct, because the statements conflict each other. It is impossible that, given A to B is 80 mph and B to C is 60 mph, both of these statements could be true. Think about this example:

Statement 1 - assume distance from A to C is 320 miles. Because A to C is 4x B to C, then A to B is 3x B to C. Its a 3:1 ratio in the distances. Therefore we have 240 miles from A to B and 80 miles from B to C. That leaves us with time of 3 hours from A to B and time of 1 hour 20 minutes from B to C.

Statement 2- this can't be possible given what we just figured out in statement 1. 3:1.33 does not equal 3:1.

The question is flawed.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 04 Dec 2024
Posts: 97,519
Own Kudos:
Given Kudos: 88,193
Products:
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 97,519
Kudos: 683,226
Kudos
Add Kudos
Bookmarks
Bookmark this Post
VeritasPrepBrandon
This question is not correct, because the statements conflict each other. It is impossible that, given A to B is 80 mph and B to C is 60 mph, both of these statements could be true. Think about this example:

Statement 1 - assume distance from A to C is 320 miles. Because A to C is 4x B to C, then A to B is 3x B to C. Its a 3:1 ratio in the distances. Therefore we have 240 miles from A to B and 80 miles from B to C. That leaves us with time of 3 hours from A to B and time of 1 hour 20 minutes from B to C.

Statement 2- this can't be possible given what we just figured out in statement 1. 3:1.33 does not equal 3:1.

The question is flawed.

Thank you for noticing this. Edited the question.
avatar
XYZABCABC
Joined: 08 May 2018
Last visit: 28 Aug 2018
Posts: 17
Own Kudos:
Given Kudos: 69
Posts: 17
Kudos: 7
Kudos
Add Kudos
Bookmarks
Bookmark this Post
chetan2u
ElCorazon
Is there a quicker way to see that the distance variable cancels out, rather than going through the entire algebraic calculation? I made the assumption that the variable would remain, and struggle to finish in ~ 2 minutes once I start getting into algebra for DS questions. Thanks..

Hi ElCorazon,
the Q stem tells us the speed in two different routes and asks us the average speed..
for this we require the distance or the ratio of distances..
lets see the statement..
1)statement 1 gives us the ratio of distance .. so sufficient..
2) statement two tells us the ratio of time so multiplying this ratio with speed would give us the ratio of distance .. again sufficient

ans D

Hello Sir,

I have understood the question and the answer to it. However, this question has put questions on my understanding.

For "Averages", we take the ratios. I have always understood that when it is average speeds, ratio of "time" needs to be taken and not the ratio of "distances". But here by ratio of distances, we are able to arrive at the average speed. Has my understanding been wrong?

Please assist.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 04 Dec 2024
Posts: 97,519
Own Kudos:
Given Kudos: 88,193
Products:
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 97,519
Kudos: 683,226
Kudos
Add Kudos
Bookmarks
Bookmark this Post
dhanush95
iam unable to see the options in the question

This is a data sufficiency question. Options for DS questions are always the same.

The data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of the word counterclockwise), you must indicate whether—

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
C. BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
D. EACH statement ALONE is sufficient to answer the question asked.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

I suggest you to go through the following posts:
ALL YOU NEED FOR QUANT.
Ultimate GMAT Quantitative Megathread

Hope this helps.
User avatar
dabaobao
Joined: 24 Oct 2016
Last visit: 20 Jun 2022
Posts: 577
Own Kudos:
1,440
 [2]
Given Kudos: 143
GMAT 1: 670 Q46 V36
GMAT 2: 690 Q47 V38
GMAT 3: 690 Q48 V37
GMAT 4: 710 Q49 V38 (Online)
GMAT 4: 710 Q49 V38 (Online)
Posts: 577
Kudos: 1,440
 [2]
1
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
NoHalfMeasures
A train traveled from Station A to Station B at an average speed of 80 kilometers per hour and then from Station B to Station C at an average speed of 60 kilometers per hour. If the train did not stop at Station B, what was the average speed at which the train traveled from Station A to C?

(1) The distance that the train traveled from Station A to Station B was 4 times the distance that train traveled from Station B to Station C.
(2) The amount of time it took to the train to travel from Station A to Station B is 3 times the amount of time that it took the train to travel from Station B to Station C.

Attachment:
Screen_Shot_2012_05_15_at_8_48_47_PM.png

Avg Speed = Total Distance/Total Time

Stmt 1) D1 = 4x; D2 = x
Avg Speed = 5x/((4x/8) + (x/60)
Sufficient

Stmt 2) T1 = 3t; T2 = t
Avg Speed = (3t*80 + t*60)/4t
Sufficient

ANSWER: D
User avatar
Basshead
Joined: 09 Jan 2020
Last visit: 07 Feb 2024
Posts: 941
Own Kudos:
Given Kudos: 432
Location: United States
Posts: 941
Kudos: 250
Kudos
Add Kudos
Bookmarks
Bookmark this Post
We're looking for the average speed at which the train traveled from Station A to C.

We are given the average speed from Station A to Station B and the average speed from Station B to Station C.

A couple things we can take away right away:
- The average speed must be between 60 kilometers and 80 kilometers.
- Since we're provided the average speed of both parts, we only need a ratio of each distance or a ratio of time spent in each part in order to find a conclusive answer.

Statement 1 gives us a ratio of the distance traveled. With a ratio of the distance traveled, we can determine the time spent in each part and come up with an average speed. Sufficient.

Statement 2 tells us a ratio of the time spent in each part. With a ratio of time spent, we can determine an average speed. Sufficient.
User avatar
AnishPassi
Joined: 16 Jul 2014
Last visit: 04 Dec 2024
Posts: 106
Own Kudos:
Given Kudos: 18
Status:GMAT Coach
Affiliations: The GMAT Co.
Concentration: Strategy
Schools: IIMA  (A)
GMAT 1: 760 Q50 V41
Expert reply
Schools: IIMA  (A)
GMAT 1: 760 Q50 V41
Posts: 106
Kudos: 494
Kudos
Add Kudos
Bookmarks
Bookmark this Post
XYZABCABC
Hello Sir,

I have understood the question and the answer to it. However, this question has put questions on my understanding.

For "Averages", we take the ratios. I have always understood that when it is average speeds, ratio of "time" needs to be taken and not the ratio of "distances". But here by ratio of distances, we are able to arrive at the average speed. Has my understanding been wrong?

Please assist.
­
No, your understanding isn't wrong.
If we are given the speeds and the ratio of distances, we can still figure out the ratio of 'times'.

The average speeds are 80 and 60 kmph.
Say the distance from
A to B is 120 km
B to C is 30 km

Then, the time taken from
A to B would be 1.5 hours
B to C would be 0.5 hours

The two times are in a ratio of 3:1


Even if you take some other distances, the ratio would remain the same.

The average speeds are 80 and 60 kmph.
Say the distance from
A to B is 240 km
B to C is 60 km

Then, the time taken from
A to B would be 3 hours
B to C would be 1 hour

Ratio of 3:1

Basically, if the distances are 4x and x km, and the speeds are 80kmph and 60kmph, , the times would be in the following ratio:

4x/80 : x/60
--> 1/20 : 1/60
--> 60 : 20
--> 3 : 1
Moderator:
Math Expert
97519 posts