Last visit was: 15 May 2026, 14:56 It is currently 15 May 2026, 14:56
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
 1   2   3   4   
555-605 (Medium)|   Math Related|         
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 15 May 2026
Posts: 110,442
Own Kudos:
815,062
 [7]
Given Kudos: 106,263
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 110,442
Kudos: 815,062
 [7]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:00
Kudos
Add Kudos
7
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide Answer
Hide
Show
History
Minimum: 1,250/4.5 Maximum: 1,350/3.5
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

35% (medium)

Question Stats:

75% (01:35) correct 25% (01:52) wrong based on 505 sessions

History

Date
Time
Result
Not Attempted Yet
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Minimum Maximum
1,300/3
1,350/3.5
1,250/3.5
1,350/4.5
1,250/4.5
1,250/5
Submit Answer
Start the Timer above, select the radio buttons, and click "Submit" to add this question to your Error log.
ShowHide Answer
Official Answer
Minimum: 1,250/4.5 Maximum: 1,350/3.5
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 15 May 2026
Posts: 110,442
Own Kudos:
815,062
Given Kudos: 106,263
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 110,442
Kudos: 815,062
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:30
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more

­

GMAT Club Official Explanation:



  • The actual volume is between 1,250 and 1,350 liters, inclusive.
  • The actual time is between 3.5 and 4.5 hours, inclusive.

For the minimum possible actual pumping rate (in liters/hour), use the lowest volume (numerator) and the highest time (denominator):

1,250/4.5 liters/hour

For the maximum possible actual pumping rate (in liters/hour), use the highest volume (numerator) and the lowest time (denominator):

1,350/3.5 liters/hour
General Discussion
User avatar
Souradeep17
User avatar
Joined: 01 May 2025
Last visit: 20 Apr 2026
Posts: 328
Own Kudos:
271
 [1]
Given Kudos: 28
Location: India
Concentration: Technology, Strategy
GMAT Focus 1: 605 Q80 V79 DI81
GPA: 9.4
WE:Information Technology (Computer Software)
GMAT Focus 1: 605 Q80 V79 DI81
Posts: 328
Kudos: 271
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:27
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
volume = 1300 L
the delta volume could be +/- 50 L

The time is 4hrs
delta time could .5 hours

for minimum rate the volume will be least, and time will be max

volume= (1300-50)/(4+0.5)
1250/4.5

similarly for maximum rate:
volume max and time minimum

vol=1350/(4-0.5) = 1350/3.5

(It seems simple hope i am not missing anything on this)
Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
hakzarif
User avatar
Joined: 31 May 2025
Last visit: 25 Oct 2025
Posts: 65
Own Kudos:
29
 [1]
Given Kudos: 9
Products:
My Reviews
Posts: 65
Kudos: 29
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:40
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
The pipe’s volume estimate can vary between 1,250 liters (1,300 minus 50) and 1,350 liters (1,300 plus 50), while the time estimate can range from 3.5 hours (4 minus 0.5) to 4.5 hours (4 plus 0.5). To find the lowest possible pumping rate, we take the smallest volume and the longest time, which gives 1,250 liters divided by 4.5 hours. For the highest possible pumping rate, we use the largest volume and the shortest time, which is 1,350 liters divided by 3.5 hours. Therefore, the minimum rate corresponds to 1,250 over 4.5, and the maximum rate corresponds to 1,350 over 3.5.

For maximizing any fraction: Maximize numerator , Minimize denominator

For minimizing any fraction: Minimize numerator , Maximize denominator
User avatar
Jarvis07
User avatar
Joined: 06 Sep 2017
Last visit: 20 Apr 2026
Posts: 306
Own Kudos:
241
 [1]
Given Kudos: 163
GMAT 1: 750 Q50 V41
GMAT 1: 750 Q50 V41
Posts: 306
Kudos: 241
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:43
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
As given in the question, actual pumping rate= (total liters)/(total hours)
To get the highest possible pumping rate, we want as much water as possible in as little time as possible. so you add 50 liters to the estimated volume and subtract 0.5 hour from the estimated time.
To get the lowest possible rate, you do the reverse: subtract 50 liters from the estimated volume and 0.5 hour to the estimated time.
Hence Minimum= (1300-50)/(4+0.5)=1250/4.5
Maximum= (1300+50)/(4-0.5)=1350/3.5
Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
Heix
User avatar
Joined: 21 Feb 2024
Last visit: 05 May 2026
Posts: 473
Own Kudos:
168
 [1]
Given Kudos: 63
Location: India
Concentration: Finance, Entrepreneurship
Schools: Ross MM "26 NUS Columbia '27
GMAT Focus 1: 485 Q76 V74 DI77
GPA: 3.4
WE:Accounting (Finance)
Products:
My Reviews
Schools: Ross MM "26 NUS Columbia '27
GMAT Focus 1: 485 Q76 V74 DI77
Posts: 473
Kudos: 168
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:50
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Given information:
* Estimated volume: 1,300 liters (may be off by up to 50 liters)
* Estimated time: 4 hours (may be off by up to 0.5 hours)
This means the actual volume could be between 1,250 and 1,350 liters, and the actual time could be between 3.5 and 4.5 hours.
To find the pumping rate, we use the formula:
Rate = Volume ÷ Time
For the minimum rate, we need the smallest possible volume divided by the largest possible time:
Minimum Rate = 1,250 ÷ 4.5 = 1,250/4.5 liters per hour
For the maximum rate, we need the largest possible volume divided by the smallest possible time:
Maximum Rate = 1,350 = 3.5 = 1,350/3.5 liters per hour
Therefore, the minimum possible pumping rate is 1,250/4.5 liters per hour, and the maximum possible pumping rate is 1,350/3.5 liters per hour.
User avatar
Emkicheru
User avatar
Joined: 12 Sep 2023
Last visit: 12 Sep 2025
Posts: 119
Own Kudos:
22
Given Kudos: 11
Location: Kenya
Schools: Anderson (UCLA) Sloan (MIT) Columbia '27
GMAT 1: 780 Q50 V48
GRE 1: Q167 V164
GPA: 3.7
Schools: Anderson (UCLA) Sloan (MIT) Columbia '27
GMAT 1: 780 Q50 V48
GRE 1: Q167 V164
Posts: 119
Kudos: 22
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 08:58
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
clearly we can see that the highest and lowest volume is equal to 1300+50 and 1300-50 and longest and shortest time is 4+0.5 and 4-0.5 therefore minimum rate is minimum litre/longest time ie 1250/4.5 amd maximum rate is highest litres/shortest time ie 1350/4.5
User avatar
k11work
User avatar
Joined: 12 Jan 2025
Last visit: 18 Nov 2025
Posts: 119
Own Kudos:
96
 [1]
Given Kudos: 84
Status:Complete
Affiliations: -
-: -
Products:
My Reviews
Posts: 119
Kudos: 96
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:03
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
V = 1300L
t = 4hrs
V_corr = 50L
t_corr = 0.5hrs

min Rate = min V / max t = 1250/4.5
max Rate = max V / min t = 1350/3.5

Thus Answer is : 1250/4.5 , 1350/3.5
User avatar
Archit3110
User avatar
Major Poster
Joined: 18 Aug 2017
Last visit: 15 May 2026
Posts: 8,648
Own Kudos:
5,198
 [1]
Given Kudos: 243
Status:You learn more from failure than from success.
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1: 545 Q79 V79 DI73
GMAT Focus 2: 645 Q83 V82 DI81
GPA: 4
WE:Marketing (Energy)
Products:
GMAT Club Tests
GMAT Focus 2: 645 Q83 V82 DI81
Posts: 8,648
Kudos: 5,198
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:09
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
total qty 1300 liters
time 4 hours
minimum pumping rate

1300-50 ; 1250
time 4 hours and 0.5 hours error ; 4.5
1250/4.5

maximum pumping rate
1300+50 ; 1350
time 4-0.5 ; 3.5 hours
1350/3.5

Minimum 1250/4.5 in liters per hour ; Maximum 1350/3.5 in liters per hour


Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
Cana1766
User avatar
Joined: 26 May 2024
Last visit: 27 Apr 2026
Posts: 85
Own Kudos:
80
 [1]
Given Kudos: 12
Posts: 85
Kudos: 80
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:12
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Rate=work/time

To maximize the pumping rate we need to increase numerator and decrease denominator.So its 1350/3.5
To minimize the pumping rate we need to decrease numneraot and increase denominaor.So its 1250/4.5

So answers are
Maximum: 1350/3.5
Minimum: 1250/4.5
Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
D3N0
User avatar
Joined: 21 Jan 2015
Last visit: 14 May 2026
Posts: 585
Own Kudos:
609
 [1]
Given Kudos: 132
Location: India
Concentration: Operations, Technology
Schools: Smeal'21 (WD) Arizona State'21 (A$) Simon '21 (WD)
GMAT 1: 620 Q48 V28
GMAT 2: 690 Q49 V35
WE:Operations (Retail: E-commerce)
Products:
My Reviews GMAT Club Tests
Schools: Smeal'21 (WD) Arizona State'21 (A$) Simon '21 (WD)
GMAT 2: 690 Q49 V35
Posts: 585
Kudos: 609
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:16
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Ans: Min = 1250/4.5 and Max = 1350/3.5

Max rate means less water more time = 1300-50 = 1250 liter water and 4 + 0.5 hrs = 4.5 hrs
Max rate means more water in less time = 1300+50 = 1350 liter water and 4 - 0.5 hrs = 3.5 hrs
User avatar
Missinga
User avatar
Joined: 20 Jan 2025
Last visit: 10 Mar 2026
Posts: 404
Own Kudos:
268
 [1]
Given Kudos: 29
Posts: 404
Kudos: 268
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:16
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Estimated volume pumped = 1300 liters. .....(+-50)
Estimated time = 4 hours.......(+-0.5 hrs)

To get Minimum Rate, select Smallest possible volume and Largest possible time
Smallest Volume = 1300 - 50 = 1250
Largest Time = 4 + 0.5 = 4.5
Minimum Rate = 1250/4.5

To get Maximum Rate, select Largest possible volume and Smallest possible time
Largest Volume = 1300 +50= 1350
Smallest Time = 4-0.5=3.5
Maximum Rate = 1350/3.5
User avatar
Kinshook
User avatar
Major Poster
Joined: 03 Jun 2019
Last visit: 15 May 2026
Posts: 6,003
Own Kudos:
5,877
 [1]
Given Kudos: 163
Location: India
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
WE:Engineering (Transportation)
Products:
My Reviews
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
Posts: 6,003
Kudos: 5,877
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:18
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Minimum pumping rate (in liters per hour) = (1300-50)/(4.5) = 1250/4.5 liters/hour
Maximum pumping rate (in liters per hour) = (1300+50)(3.5) = 1350/3.5 liters/hour

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.

MinimumMaximum
1250/4.51350/3.5
User avatar
A_Nishith
User avatar
Joined: 29 Aug 2023
Last visit: 12 Nov 2025
Posts: 451
Own Kudos:
204
 [1]
Given Kudos: 16
Posts: 451
Kudos: 204
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:23
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
To find the minimum pumping rate, we need the minimum possible volume and the maximum possible time.
Minimum volume = 1300−50=1250 liters
Maximum time = 4+0.5=4.5 hours
Minimum pumping rate = 1250/4.5 liters/hour

To find the maximum pumping rate, we need the maximum possible volume and the minimum possible time.
Maximum volume = 1300+50=1350 liters
Minimum time = 4−0.5=3.5 hours
Maximum pumping rate = 1350/3.5 liters/hour

Therefore:
Minimum: 1250/4.5
Maximum: 1350/3.5
User avatar
Decimal
User avatar
Joined: 20 Jul 2022
Last visit: 03 Oct 2025
Posts: 9
Own Kudos:
9
 [1]
Given Kudos: 16
Posts: 9
Kudos: 9
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:33
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Given

Total water pumped = 1300 liters; error margin +/- 50 liters
Total time taken = 4 hours; error margin +/- 0.5 hours

Asked:

Minimum Possible Actual Pumping Rate
=> Minimum possible water pumped / Maximum possible time = 1250 / 4.5 liters/hours

Maximum Possible Actual Pumping Rate
=> Maximum possible water pumped / minimum possible time = 1350 / 3.5 liters/hours

Hence, for each respective column, these figures can be checked.

Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
iamchinu97
User avatar
Joined: 14 Dec 2020
Last visit: 09 May 2026
Posts: 136
Own Kudos:
146
 [1]
Given Kudos: 35
Products:
My Reviews
Posts: 136
Kudos: 146
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:33
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Okay
So 1250 <=volume <= 1350
and 3.5<=time<=4.5

and we can get min be = min/max = 1250/4.5
Now we can get max by = (max)/min = 1350/3.5
User avatar
Dipan0506
User avatar
Joined: 24 May 2021
Last visit: 15 May 2026
Posts: 72
Own Kudos:
14
Given Kudos: 3
Products:
GMAT Club Tests
Posts: 72
Kudos: 14
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:35
Kudos
Add Kudos
Bookmarks
Bookmark this Post
We can derive from the sum the minimum and the maximum value
User avatar
AviNFC
User avatar
Joined: 31 May 2023
Last visit: 10 Apr 2026
Posts: 306
Own Kudos:
366
 [1]
Given Kudos: 5
Posts: 306
Kudos: 366
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:36
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
minimum:
min vol., max time = 1300-50 / 4+0.5 = 1250/4.5
maximum:
max vol., min time = 1300+50/4-0.5 = 1350/3.5
avatar
ManifestDreamMBA
avatar
Joined: 17 Sep 2024
Last visit: 21 Feb 2026
Posts: 1,387
Own Kudos:
901
 [1]
Given Kudos: 243
Posts: 1,387
Kudos: 901
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:48
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Volume pumped = 1250<=V<=1350.
Time = 3.5<=T<=4.5

Min actual pumping rate = Min V/Max T = 1250/4.5

Max actual pumping rate = MaxV/Min T = 1350/3.5

Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
User avatar
APram
User avatar
Joined: 23 Jun 2024
Last visit: 17 Mar 2026
Posts: 708
Own Kudos:
280
 [1]
Given Kudos: 248
Location: India
Schools: ISB '26 HEC INSEAD Jan '26
GMAT Focus 1: 605 Q86 V78 DI76
GPA: 3.608
Schools: ISB '26 HEC INSEAD Jan '26
GMAT Focus 1: 605 Q86 V78 DI76
Posts: 708
Kudos: 280
 [1]
GMAT Club Olympics 2025 (Day 10): A maintenance team estimated that 11 Jul 2025, 09:50
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Volume can range from 1250 L to 1350 L
Time can range from 3.5 hrs to 4.5 hrs

So minimum rate will be one with lowest volume and highest time ie 1250/4.5
and Maximum rate will be one with highest volume and lowest time ie 1350/3.5

Hence answer is:
Minimum 1250/4.5
Maximum 1350/3.5
Bunuel
 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 



A maintenance team estimated that a certain pipe pumped 1,300 liters of water into a storage tank in 4 hours. The volume estimate may be off by up to and including 50 liters, and the time estimate may be off by up to and including 0.5 hours.

Select for Minimum the lowest possible actual pumping rate (in liters per hour), and select for Maximum the highest possible actual pumping rate (in liters per hour), consistent with these estimation ranges. Make only two selections, one in each column.
Show more
 1   2   3   4   
Moderators:
Bunuel
Math Expert
110442 posts
kingbucky
498 posts
Gmat860sanskar
261 posts