Oct 14 08:00 PM PDT  11:00 PM PDT Join a 4day FREE online boot camp to kick off your GMAT preparation and get you into your dream bschool in R2.**Limited for the first 99 registrants. Register today! Oct 15 12:00 PM PDT  01:00 PM PDT Join this live GMAT class with GMAT Ninja to learn to conquer your fears of long, kooky GMAT questions. Oct 16 08:00 PM PDT  09:00 PM PDT EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth $100 with the 3 Month Pack ($299) Oct 19 07:00 AM PDT  09:00 AM PDT Does GMAT RC seem like an uphill battle? eGMAT is conducting a free webinar to help you learn reading strategies that can enable you to solve 700+ level RC questions with at least 90% accuracy in less than 10 days. Sat., Oct 19th at 7 am PDT Oct 20 07:00 AM PDT  09:00 AM PDT Get personalized insights on how to achieve your Target Quant Score.
Author 
Message 
TAGS:

Hide Tags

Manager
Joined: 31 Oct 2011
Posts: 213

How long did it take Betty to drive nonstop on a trip from
[#permalink]
Show Tags
14 Mar 2012, 15:19
Question Stats:
68% (01:16) correct 32% (01:20) wrong based on 379 sessions
HideShow timer Statistics
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 \(1\frac{1}{2}\) times as fast, the trip would have taken 2 hours. (2) Betty's average speed for the trip was 50 miles per hour.
Official Answer and Stats are available only to registered users. Register/ Login.



Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4473

Re: PT #13 DS 22
[#permalink]
Show Tags
14 Mar 2012, 16:34
Hi, there. I'm happy to help with this. 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/927When 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
_________________
Mike McGarry Magoosh Test PrepEducation is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)



Senior Manager
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 423
Location: India
GMAT 1: 640 Q43 V34 GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)

Re: PT #13 DS 22
[#permalink]
Show Tags
28 Nov 2012, 19:40
mikemcgarry wrote: Hi, there. I'm happy to help with this. 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/927When 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*RHi, 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.Who says you need a 700 ?Check this out : http://gmatclub.com/forum/whosaysyouneeda149706.html#p1201595My GMAT Journey : http://gmatclub.com/forum/endofmygmatjourney149328.html#p1197992



Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4473

Re: PT #13 DS 22
[#permalink]
Show Tags
28 Nov 2012, 22:45
Sachin9 wrote: Hi, Should the above not be D = (2.5R)*2 = 3*R? Doesn't '1.5 times as fast ' imply 2.5R? No, it doesn't. This is a very subtle verbal thing. Suppose I have some beginning speed V. If I have a speed that is 1.5 time faster than this, that's 1.5*V BUT, if the speed increases by 1.5 this value, then that's V + 1.5*V = 2.5*V Moving at a speed 1.5 faster than the original is not the same as increasing your speed by 1.5 times beyond what the original was. Does this distinction make sense? Mike
_________________
Mike McGarry Magoosh Test PrepEducation is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)



Senior Manager
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 423
Location: India
GMAT 1: 640 Q43 V34 GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)

Re: PT #13 DS 22
[#permalink]
Show Tags
29 Nov 2012, 19:59
mikemcgarry wrote: Sachin9 wrote: Hi, Should the above not be D = (2.5R)*2 = 3*R? Doesn't '1.5 times as fast ' imply 2.5R? No, it doesn't. This is a very subtle verbal thing. Suppose I have some beginning speed V. If I have a speed that is 1.5 time faster than this, that's 1.5*V BUT, if the speed increases by 1.5 this value, then that's V + 1.5*V = 2.5*V Moving at a speed 1.5 faster than the original is not the same as increasing your speed by 1.5 times beyond what the original was. Does this distinction make sense? Mike Thanks Mike, I suppose this is how it should be 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 This is how we apply for percentage based concepts.. Is my understanding correct? Regards, Sachin
_________________
hope is a good thing, maybe the best of things. And no good thing ever dies.Who says you need a 700 ?Check this out : http://gmatclub.com/forum/whosaysyouneeda149706.html#p1201595My GMAT Journey : http://gmatclub.com/forum/endofmygmatjourney149328.html#p1197992



Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4473

Re: PT #13 DS 22
[#permalink]
Show Tags
30 Nov 2012, 12:55
Sachin9 wrote: Thanks Mike, I suppose this is how it should be
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
_________________
Mike McGarry Magoosh Test PrepEducation is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)



Senior Manager
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 423
Location: India
GMAT 1: 640 Q43 V34 GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)

Re: PT #13 DS 22
[#permalink]
Show Tags
30 Nov 2012, 19:24
mikemcgarry wrote: Sachin9 wrote: Thanks Mike, I suppose this is how it should be
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.Who says you need a 700 ?Check this out : http://gmatclub.com/forum/whosaysyouneeda149706.html#p1201595My GMAT Journey : http://gmatclub.com/forum/endofmygmatjourney149328.html#p1197992



Director
Joined: 29 Nov 2012
Posts: 708

How long did it take Betty to drive nonstop on a trip from
[#permalink]
Show Tags
21 Jan 2013, 02:34
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?



Math Expert
Joined: 02 Sep 2009
Posts: 58320

Re: How long did it take Betty to drive nonstop on a trip from
[#permalink]
Show Tags
21 Jan 2013, 03:53
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.
_________________



Senior Manager
Joined: 13 May 2013
Posts: 405

Re: How long did it take Betty to drive nonstop on a trip from
[#permalink]
Show Tags
01 Aug 2013, 11:14
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. Time = Distance/speed
Time (faster trip): 2 = d/1.5s 3s=d
Time (slower trip): t=D/S t=3s/s t=3 SUFFICIENT
(2) Betty's average speed for the trip was 50 miles per hour. No information given about distance. INSUFFICIENT
(A)



NonHuman User
Joined: 09 Sep 2013
Posts: 13143

Re: How long did it take Betty to drive nonstop on a trip from
[#permalink]
Show Tags
29 Oct 2018, 23:03
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]
29 Oct 2018, 23:03






