Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 1612:00 PM EDT
-11:59 PM EDT
You’re first to know: Save $200 on GMAT prep starting tomorrow, 4/13. Get 6 official practice tests and study with real questions. Be ready to save!
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
29 Jan 2024, 01:02
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
94% (01:06) correct
6%
(01:42)
wrong
based on 459
sessions
History
Date
Time
Result
Not Attempted Yet
Ed's own pump, operating alone at its constant rate, can empty his swimming pool in 15 hours. The pump Ed rented, operating alone at its constant rate, can empty his swimming pool in 5 hours. How many hours will it take the two pumps, operating simultaneously and independently at their respective constant rates, to empty Ed's pool?
A. \(3\)
B. \(3 \frac{1}{4}\)
C. \(3 \frac{1}{2}\)
D. \(3 \frac{3}{4}\)
E. \(4\)
2024-01-29_11-58-03.png [ 51.9 KiB | Viewed 5044 times ]
A. \(3\)
B. \(3 \frac{1}{4}\)
C. \(3 \frac{1}{2}\)
D. \(3 \frac{3}{4}\)
E. \(4\)
Attachment:
2024-01-29_11-58-03.png [ 51.9 KiB | Viewed 5044 times ]
Pro tip:
Combine official questions for familiarity with GMAT Club Tests for analytics and tougher Focus-level practice so the real exam feels manageable.
Explore →
29 Jan 2024, 01:10
Kudos
Bookmarks
guddo
Assuming the rate of Ed's own pump is x pool/hour and the rate of the rented pump is y pool/hour, we'd have:
- x = 1/15
y = 1/5
Summing these up to get the combined rate of the two pumps gives:
- x + y = 1/15 + 1/5 = 4/15.
Since rate is the reciprocal of time, the two pumps will take \(\frac{15}{4 }= 3 \frac{3}{4}\) hours to empty the pool.
Answer: D.
Alternatively, notice that the rented pump, being thrice as fast as Ed's pump, does the job equal to three of Ed's pumps. Thus, when the two pumps are working together, it's like 1 + 3 = 4 of Ed's pumps working together. Consequently, 4 of Ed's pumps would need \(\frac{15}{4 }= 3 \frac{3}{4}\) hours to empty the pool.
Answer: D.
25 Oct 2024, 10:55
Kudos
Bookmarks
Standard combined work problem:
