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.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Prompt: How long did it take Betty to drive nonstop on a trip from her home to Denver, Colorado?
To apply D = RT, we would have to know both the distance and the speed to find the time.
Statement #1: If Betty's average speed for the trip had been 1 and 1/2 times as fast, the trip would have taken 2 hours.
Let D be the distance, and R be her speed. What this is saying is:
D = (1.5R)*2 = 3*R
This implies T = D/R = 3 --- the trip took her 3 hours. Statement #1, by itself, is sufficient.
Statement #2: Betty's average speed for the trip was 50 miles per hour.
Well, we know the average speed, but we don't know where Betty lives --- we have no idea of the distance from her home to Denver. Since we know R and don't know D, we can't find T. Statement #2, by itself, is insufficient.
Here's a similar DS question, for more practice: http://gmat.magoosh.com/questions/927 When you submit your answer to that, the next page will have a complete video explanation.
Does all this make sense? Please let me know if you have any questions.
Prompt: How long did it take Betty to drive nonstop on a trip from her home to Denver, Colorado?
To apply D = RT, we would have to know both the distance and the speed to find the time.
Statement #1: If Betty's average speed for the trip had been 1 and 1/2 times as fast, the trip would have taken 2 hours.
Let D be the distance, and R be her speed. What this is saying is:
D = (1.5R)*2 = 3*R
This implies T = D/R = 3 --- the trip took her 3 hours. Statement #1, by itself, is sufficient.
Statement #2: Betty's average speed for the trip was 50 miles per hour.
Well, we know the average speed, but we don't know where Betty lives --- we have no idea of the distance from her home to Denver. Since we know R and don't know D, we can't find T. Statement #2, by itself, is insufficient.
Here's a similar DS question, for more practice: http://gmat.magoosh.com/questions/927 When you submit your answer to that, the next page will have a complete video explanation.
Does all this make sense? Please let me know if you have any questions.
Mike
D = (1.5R)*2 = 3*R
Hi, Should the above not be D = (2.5R)*2 = 3*R?
doesnt '1.5 times as fast ' imply 2.5R? _________________
hope is a good thing, maybe the best of things. And no good thing ever dies.
If I have a speed that is 1.5 times faster than this, that's 2.5*V If I have a speed that is 1.5 times as fast as this, that's 1.5*V Is my understanding correct?
Dear Sachin
We are getting into some really subtleties of grammar and phrasing here.
If I have a speed that is 1.5 times as fast as V ----> that clearly should be 1.5*V
If my speed was V, but increased by 1.5 this value ----> that clearly should be 2.5*V
If I have a speed that is 1.5 times faster than V -----> not 100% percent clear, but I would say most people would interpret this as 1.5*V. The GMAT is always crystal clear in its phrasing. There is no way they would use this phrasing and expect you to come up with 2.5*V.
Part of what is unusual about this conversation is we are talking about the increases of speed. Almost everyone compares speed by saying "n times faster." In real life, no one ever talks about percentage increase or decreases for speed.
Let's change the subject to something like profits. You are perfectly correct ---- If I say "profits increased by 150%", that's 2.5 times the original profits.
If I have a speed that is 1.5 times faster than this, that's 2.5*V If I have a speed that is 1.5 times as fast as this, that's 1.5*V Is my understanding correct?
Dear Sachin
We are getting into some really subtleties of grammar and phrasing here.
If I have a speed that is 1.5 times as fast as V ----> that clearly should be 1.5*V
If my speed was V, but increased by 1.5 this value ----> that clearly should be 2.5*V
If I have a speed that is 1.5 times faster than V -----> not 100% percent clear, but I would say most people would interpret this as 1.5*V. The GMAT is always crystal clear in its phrasing. There is no way they would use this phrasing and expect you to come up with 2.5*V.
Part of what is unusual about this conversation is we are talking about the increases of speed. Almost everyone compares speed by saying "n times faster." In real life, no one ever talks about percentage increase or decreases for speed.
Let's change the subject to something like profits. You are perfectly correct ---- If I say "profits increased by 150%", that's 2.5 times the original profits.
Does all this make sense?
Mike
You Mike, It does Thanks a lot _________________
hope is a good thing, maybe the best of things. And no good thing ever dies.
Re: How long did it take Betty to drive nonstop on a trip from [#permalink]
21 Jan 2013, 02:53
Expert's post
fozzzy wrote:
alimad wrote:
How long did it take betty to drive nonstop on a trip from her home to Denver, Colorado?
(1). If Betty's average speed for the trip had been 1 1/2 times as fast, the trip would have taken 2 hours.
(2). Betty's average speed for the trip was 50 miles / hour.
The distance is similar in this question
equation 1 X be speed, t is the time and d is the distance
X*t=d
equation 2
1.5X*2=d >> 3X=d
substitute in 1
x*t=3X
t=3
is this approach correct?
Yes, it is. Even without any formula: since moving 1.5 times as fast as the actual speed would take 2 hours to cover the distance, then moving at actual speed would take 2*1.5=3 hours to cover the same distance. _________________
Re: How long did it take Betty to drive nonstop on a trip from [#permalink]
15 Jan 2015, 07:41
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________
Re: How long did it take Betty to drive nonstop on a trip from [#permalink]
28 Jan 2016, 04:46
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________
The “3 golden nuggets” of MBA admission process With ten years of experience helping prospective students with MBA admissions and career progression, I will be writing this blog through...
You know what’s worse than getting a ding at one of your dreams schools . Yes its getting that horrid wait-listed email . This limbo is frustrating as hell . Somewhere...