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• $450 Tuition Credit & Official CAT Packs FREE November 15, 2018 November 15, 2018 10:00 PM MST 11:00 PM MST EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth$100 with the 3 Month Pack ($299) • Free GMAT Strategy Webinar November 17, 2018 November 17, 2018 07:00 AM PST 09:00 AM PST Nov. 17, 7 AM PST. Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT. Airplanes A and B traveled the same 360-mile route  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Hide Tags Retired Moderator Status: 2000 posts! I don't know whether I should feel great or sad about it! LOL Joined: 04 Oct 2009 Posts: 1196 Location: Peru Schools: Harvard, Stanford, Wharton, MIT & HKS (Government) WE 1: Economic research WE 2: Banking WE 3: Government: Foreign Trade and SMEs Airplanes A and B traveled the same 360-mile route [#permalink] Show Tags 02 Mar 2012, 08:28 00:00 Difficulty: 5% (low) Question Stats: 93% (01:32) correct 7% (01:34) wrong based on 138 sessions HideShow timer Statistics Airplanes A and B traveled the same 360-mile route. If airplane A took 2 hours and airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, how many hours did it take airplane B to travel the route? (A) 2 (B) $$2\frac{1}{3}$$ (C) $$2\frac{1}{2}$$ (D) $$2\frac{2}{3}$$ (E) 3 I agree with the OA. However, something that I don't understand is why cannot analyze it in this way: The question says that airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, right? The OE says that, based on this info, that airplane A travels at 180 mph, so airplane B travels at 120 mph (1/3 slower). Why cannot "1/3 slower" mean this? A ---- 180 miles / 1 hour B ---- 180 miles /[(4/3)*1hour] The answer would be different. Please, your comments. Source: http://www.gmathacks.com _________________ "Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can." My Integrated Reasoning Logbook / Diary: http://gmatclub.com/forum/my-ir-logbook-diary-133264.html GMAT Club Premium Membership - big benefits and savings Math Expert Joined: 02 Sep 2009 Posts: 50585 Re: Airplanes A and B traveled the same 360-mile route [#permalink] Show Tags 02 Mar 2012, 08:47 1 metallicafan wrote: Airplanes A and B traveled the same 360-mile route. If airplane A took 2 hours and airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, how many hours did it take airplane B to travel the route? (A) 2 (B) $$2\frac{1}{3}$$ (C) $$2\frac{1}{2}$$ (D) $$2\frac{2}{3}$$ (E) 3 I agree with the OA. However, something that I don't understand is why cannot analyze it in this way: The question says that airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, right? The OE says that, based on this info, that airplane A travels at 180 mph, so airplane B travels at 120 mph (1/3 slower). Why cannot "1/3 slower" mean this? A ---- 180 miles / 1 hour B ---- 180 miles /[(4/3)*1hour] The answer would be different. Please, your comments. Source: http://www.gmathacks.com The red part should be 3/2. I'd approach this question in different manner and hope that it helps you to understand the question better. Since B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, then the speed of B was $$\frac{2}{3}$$ of that of A ($$x-\frac{1}{3}x=\frac{2}{3}x$$). So, airplane B would need $$\frac{3}{2}$$ times more time to cover the same distance: $$2*\frac{3}{2}=3$$ hours. That's because time*rate=distance, so if you decrease rate 2/3 times you'll need 3/2 times as many hours to cover the same distance. Answer: E. _________________ SVP Joined: 06 Sep 2013 Posts: 1745 Concentration: Finance Re: Airplanes A and B traveled the same 360-mile route [#permalink] Show Tags 31 Dec 2013, 09:41 metallicafan wrote: Airplanes A and B traveled the same 360-mile route. If airplane A took 2 hours and airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, how many hours did it take airplane B to travel the route? (A) 2 (B) $$2\frac{1}{3}$$ (C) $$2\frac{1}{2}$$ (D) $$2\frac{2}{3}$$ (E) 3 I agree with the OA. However, something that I don't understand is why cannot analyze it in this way: The question says that airplane B traveled at an average speed that was $$\frac{1}{3}$$ slower than the average speed of airplane A, right? The OE says that, based on this info, that airplane A travels at 180 mph, so airplane B travels at 120 mph (1/3 slower). Why cannot "1/3 slower" mean this? A ---- 180 miles / 1 hour B ---- 180 miles /[(4/3)*1hour] The answer would be different. Please, your comments. Source: http://www.gmathacks.com Easy question A traveled at 180mph 2/3*180 = 120mph Hence B made the trip in 360/120 = 3 hours Or recall that as distance is constant, then B will need 3/2 as much time as A to cover same distance So it will give 3 as well Hope it helps Cheers! J EMPOWERgmat Instructor Status: GMAT Assassin/Co-Founder Affiliations: EMPOWERgmat Joined: 19 Dec 2014 Posts: 12856 Location: United States (CA) GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Airplanes A and B traveled the same 360-mile route [#permalink] Show Tags 22 Nov 2017, 19:09 1 Hi All, If you don't realize how that relationship between speed and time applies in these types of questions, then you can still answer this question with some basic arithmetic. We're told that Airplane A traveled a 360-mile route in 2 hours. Thus, it traveled at 360/2 = 180 miles per hour. We're also told that Airplane B traveled the SAME distance at an average speed that was 1/3 SLOWER than the average speed of airplane A. One third of 180 is 60, so Airplane B traveled at 180 - 60 = 120 miles per hour. We're asked for the number of hours that it took Airplane B to travel the route.... Distance = (Rate)(Time) 360 miles = (120 mi/hour)(T) 360/120 = T 3 hours = T Final Answer: GMAT assassins aren't born, they're made, Rich _________________ 760+: Learn What GMAT Assassins Do to Score at the Highest Levels Contact Rich at: Rich.C@empowergmat.com Rich Cohen Co-Founder & GMAT Assassin Special Offer: Save$75 + GMAT Club Tests Free
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Airplanes A and B traveled the same 360-mile route &nbs [#permalink] 22 Nov 2017, 19:09
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