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Register now and save up to $200 Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • 5-Day Free Trial 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code Airplanes A and B traveled the same 360-mile route... This topic has 2 expert replies and 0 member replies Top Member LUANDATO Master | Next Rank: 500 Posts Joined 15 Oct 2017 Posted: 195 messages Followed by: 1 members Airplanes A and B traveled the same 360-mile route... Fri Nov 03, 2017 9:29 am Elapsed Time: 00:00 • Lap #[LAPCOUNT] ([LAPTIME]) 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 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(1/3) (C) 2(1/2) (D) 2(2/3) (E) 3 The OA is E. I don't understand why that is the correct answer. Please can any expert explain this PS question for me? Thanks. Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums! GMAT/MBA Expert DavidG@VeritasPrep Legendary Member Joined 14 Jan 2015 Posted: 2377 messages Followed by: 115 members Thanked: 1118 times GMAT Score: 770 Fri Nov 03, 2017 9:53 am LUANDATO 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 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(1/3) (C) 2(1/2) (D) 2(2/3) (E) 3 The OA is E. I don't understand why that is the correct answer. Please can any expert explain this PS question for me? Thanks. Time and rate have a reciprocal relationship. For example, if you run twice as fast I do, you'd cover the same distance in 1/2 the time. If you ran 4/3 as fast as I did, you'd cover the same distance in 3/4 the time, etc. If plane B's rate is 1/3 less than A's rate, then B's rate is 2/3 of A's rate. If B's rate is 2/3 of A's rate, then it covers the same distance in 3/2 the time. If A did the trip in 2 hours, then B did it in (3/2)*2 = 3 hours. The answer is E. (Note that the actual distance doesn't matter here. What's relevant is that each plane traveled the same distance.) _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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Rich.C@EMPOWERgmat.com Elite Legendary Member
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Sun Nov 05, 2017 12:24 pm
Hi LUANDATO,

David's explanation about the relationship between Rate and Time is spot-on. If you don't realize how that relationship 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

GMAT assassins aren't born, they're made,
Rich

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