Author 
Message 
TAGS:

Hide Tags

Director
Joined: 29 Nov 2012
Posts: 878

If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
01 Jun 2013, 02:38
2
This post received KUDOS
3
This post was BOOKMARKED
Question Stats:
74% (01:53) correct
26% (01:00) wrong based on 219 sessions
HideShow timer Statistics
If Danielle ran a race at a constant speed, at what time did she finish? (1) Danielle started the race at 8:00 a.m. (2) At 9:30 a.m. Danielle was halfway through the race, and at 10:00 a.m., she was 2/3 of the way through the race. Please provide detailed explanation!
Official Answer and Stats are available only to registered users. Register/ Login.
_________________
Click +1 Kudos if my post helped...
Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/
GMAT Prep software What if scenarios http://gmatclub.com/forum/gmatprepsoftwareanalysisandwhatifscenarios146146.html



VP
Status: Far, far away!
Joined: 02 Sep 2012
Posts: 1122
Location: Italy
Concentration: Finance, Entrepreneurship
GPA: 3.8

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
01 Jun 2013, 02:43
1
This post received KUDOS
1
This post was BOOKMARKED
If Danielle ran a race at a constant speed, at what time did she finish? (1) Danielle started the race at 8:00 a.m.No info about the speed, or time. Not sufficient (2) At 9:30 a.m. Danielle was halfway through the race, and at 10:00 a.m., she was 2/3 of the way through the race.This means that in 30 minutes (10:009:30) she runs \(\frac{2}{3}\frac{1}{2}=\frac{1}{6}\) of the race. At 10:00 she has \(\frac{1}{3}\) left to run or \(\frac{2}{6}\) and, according to the upper calculus, she will run it in \(1\) hour (1/6 every 30 minutes). She will finish at 11:00 am. Sufficient B
_________________
It is beyond a doubt that all our knowledge that begins with experience.
Kant , Critique of Pure Reason Tips and tricks: Inequalities , Mixture  Review: MGMAT workshop Strategy: SmartGMAT v1.0  Questions: Verbal challenge SC III CR New SC set out !! , My QuantRules for Posting in the Verbal Forum  Rules for Posting in the Quant Forum[/size][/color][/b]



Senior Manager
Joined: 28 Dec 2010
Posts: 330
Location: India

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
22 Jun 2013, 10:49
solved in 32 secs. exactly the approach by zarrolou. between 9.30 and 10 she covers 2/3 1/2 part of the journey. Therefore we can calculate the time required to travel 1/2 of the distance and adding this time to 9.30 we get the time of finish.



Senior Manager
Joined: 13 May 2013
Posts: 469

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
30 Jul 2013, 13:55
If Danielle ran a race at a constant speed, at what time did she finish?
(1) Danielle started the race at 8:00 a.m. This tells us nothing about when she finished, how far she ran, rate, etc. INSUFFICIENT
(2) At 9:30 a.m. Danielle was halfway through the race, and at 10:00 a.m., she was 2/3 of the way through the race. Lets say she ran 10 miles. In 1.5 hours she ran 5/10 miles. in 2.0 hours she ran roughly 6.67 miles.
Every half hour she ran (5/10) / (1/3) miles: 1.67miles. If she ran at a constant speed, that means she finished the race by 11 A.M. It's not the distance that is important but rather, the rate she runs at. If her rate is constant and she finishes the intervals at the same time, the distance she covers is irrelevant. SUFFICIENT
(B)



GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15968

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
10 Feb 2015, 15:18
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.
_________________
GMAT Books  GMAT Club Tests  Best Prices on GMAT Courses  GMAT Mobile App  Math Resources  Verbal Resources



Manager
Joined: 18 Mar 2014
Posts: 237
Location: India
Concentration: Operations, Strategy
GPA: 3.19
WE: Information Technology (Computer Software)

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
03 Apr 2015, 08:16
only B is enough . at 9.30 he had completed half race , and at 10 he had compelted 2/3 rd race so within half hour he compelted (1/22/3)th race. since speed is constant . Its possible to calcuate when race will over. (no need to calculate though)
_________________
Press +1 Kudos if you find this Post helpful



GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15968

Re: If Danielle ran a race at a constant speed, at what time did [#permalink]
Show Tags
13 Oct 2016, 07:21
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.
_________________
GMAT Books  GMAT Club Tests  Best Prices on GMAT Courses  GMAT Mobile App  Math Resources  Verbal Resources




Re: If Danielle ran a race at a constant speed, at what time did
[#permalink]
13 Oct 2016, 07:21







