Forum Home > GMAT > Quantitative > Problem Solving (PS)
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.
- Jun 06
08:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations! - Jun 07
12:00 PM PDT
-01:00 PM PDT
In this GMAT experience talk show, we talk to Tavishi, a young MBA aspirant from India who recently scored 725 in her latest GMAT Focus exam. It’s a 99.9 percentile score on the new GMAT Focus edition and she achieved this feat in her first GMAT attempt. - Jun 08
05:30 AM PDT
-07:30 AM PDT
The Focus Edition allows barely 2 minutes per question. Hence, rereading portions of passages is not an option. Learn our Involved and Evolved reading strategy, the most efficacious solution to time saving on RC and score high on GMAT Verbal! - Jun 08
11:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test. - Jun 11
05:30 AM PDT
-12:00 PM PDT
Register for the GMAT Club Virtual MBA Spotlight fair, the biggest MBA fair of the year. You will have a chance to hear Admissions directors from almost every Top 20 program speak, network with peers, and more.
Manager
Joined: 13 Sep 2016
Posts: 103
Given Kudos: 348
GMAT 1: 800 Q51 V51
If snow accumulation increased at a constant rate of 30 millimeters pe
[#permalink]
09 May 2018, 03:34
2
Kudos
10
Bookmarks
Show timer
00:00
A
B
C
D
E
Difficulty:
Question Stats:
81% (01:03) correct
If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
A. 1/120
B. 1/60
C. 1/20
D. 20
E. 120
A. 1/120
B. 1/60
C. 1/20
D. 20
E. 120
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 6817
Given Kudos: 799
Location: Canada
Re: If snow accumulation increased at a constant rate of 30 millimeters pe
[#permalink]
09 May 2018, 07:08
5
Kudos
1
Bookmarks
Expert Reply
Top Contributor
alanforde800Maximus wrote:
If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
Let's keep listing EQUIVALENT RATES until we get to 1 millimeter
30 millimeters per hour = 30 millimeters per 60 minutes
= 30 millimeters per 3600 SECONDS
= 3 millimeters per 360 SECONDS
= 1 millimeter per 120 SECONDS
Answer: E
Cheers,
Brent
General Discussion
Re: If snow accumulation increased at a constant rate of 30 millimeters pe
[#permalink]
09 May 2018, 08:59
Expert Reply
alanforde800Maximus wrote:
If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
I suspect the trap answer is A. It is easy to overlook units.
Shortcut: 1 hour = 3600 seconds
\(\frac{30mm}{1hour}=\frac{30mm}{3600secs}=\frac{1mm}{120secs}\)
Units are not the same. The answer is not A. In 120 seconds, 1mm of snow will accumulate.
Answer E
No shortcut: \((\frac{30mm}{1hour}*\frac{1hour}{60mins}*\frac{1min}{60secs})=\frac{30mm}{(60*60)secs}=\frac{30mm}{3600secs}\)
In the parentheses, hours and minutes cancel. Factor out 30, write the final units: \(\frac{1mm}{120secs}\)
Answer E