• NEW! FREE Beat The GMAT Quizzes
Hundreds of Questions Highly Detailed Reporting Expert Explanations
• 7 CATs FREE!
If you earn 100 Forum Points

Engage in the Beat The GMAT forums to earn
100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## An airline passenger is planning a trip that involves three ##### This topic has 2 expert replies and 1 member reply ### Top Member ## An airline passenger is planning a trip that involves three ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B 3/2 hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C 7/6 hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules? (A) 25 min (B) 1 hr 5 min (C) 1 hr 15 min (D) 2 hr 20 min (E) 3 hr 40 min OA B Source: Official Guide ### GMAT/MBA Expert GMAT Instructor Joined 25 Apr 2015 Posted: 2006 messages Followed by: 14 members Upvotes: 43 Top Reply BTGmoderatorDC wrote: An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B 3/2 hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C 7/6 hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules? (A) 25 min (B) 1 hr 5 min (C) 1 hr 15 min (D) 2 hr 20 min (E) 3 hr 40 min Notice that the flight from Airport A to Airport B takes 3/2 hours = 90 minutes (or 1 hour 30 minutes), and the flight from Airport B to Airport C takes 7/6 hours = 70 minutes (or 1 hour 10 minutes). Let’s say the first flight leaves A at 8 am; it would then arrive at B at 9:30 am. Then we have to wait 10 minutes since the next flight would leave B at 9:40 am and arrive at airport C 1 hour and 10 minutes later, or at 10:50 am. However, we have to wait 55 minutes since the next flight would leave C at 11:45 am. Thus, in this case we have to wait a total of 10 + 55 = 65 minutes or 1 hour 5 minutes. This is answer choice B. Looking at the answer choices, we see there is only one answer choice with a waiting time less than 1 hour 5 minutes. However, there is no way we can wait for the connecting flight for as little as 25 minutes (which is choice A). For example, when we arrive at Airport B at 9:30 am, if we don’t take the 9:40 am flight, then the next flight leaving from B is at 10 am, which means we have to wait 30 minutes already. Choosing different flights out of Airport A will not change the waiting time either, since every flight out of Airport A arrive at Airport B at half hours. Thus, the least total amount of time we have to wait for the connecting flights is 1 hour 5 minutes (described in the previous paragraph). Answer: B _________________ Scott Woodbury-Stewart Founder and CEO ### Top Member Legendary Member Joined 29 Oct 2017 Posted: 777 messages Followed by: 4 members Top Reply Arrives . . . . . . . . Waits . . . . . . . . Leaves A 8a . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . 8a B 9:30a . . . . . . . 10mins . . . . . . . 9:40a (flights every 20mins) C 10:50a . . . . . 55mins . . . . . . . 11:45a (flights every hour starting at 8:45) Total . . . . . . . . . . 65mins ### GMAT/MBA Expert GMAT Instructor Joined 09 Oct 2010 Posted: 1273 messages Followed by: 29 members Upvotes: 59 BTGmoderatorDC wrote: An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B 3/2 hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C 7/6 hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules? (A) 25 min (B) 1 hr 5 min (C) 1 hr 15 min (D) 2 hr 20 min (E) 3 hr 40 min Source: Official Guide FOCUS: minimum (sum of between-flights times) Let´s say now is 8:00 a.m., perfect moment for the passenger to catch his/her first flight. He/She will be "ready" for next flight from 9:30 a.m. on, therefore he/she MUST wait 10min to catch at 9:40 a.m. One hour and 10min later (hence 10:50 a.m.) he/she will be "ready" for the third flight, that will be caught only 11:45 a.m. Hence He/She must wait 55min to be on that flight. ? = (10+55)min = 1h5min. This solution follows the notations and rationale taught in the GMATH method. Regards, fskilnik. _________________ Fabio Skilnik :: GMATH method creator ( Math for the GMAT) English-speakers :: https://www.gmath.net Portuguese-speakers :: https://www.gmath.com.br • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE 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 Veritas GMAT Class Experience Lesson 1 Live Free 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 • 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 • Award-winning private GMAT tutoring Register now and save up to$200

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• FREE GMAT Exam
Know how you'd score today for \$0

Available with Beat the GMAT members only code

### Top First Responders*

1 Brent@GMATPrepNow 65 first replies
2 fskilnik@GMATH 61 first replies
3 GMATGuruNY 46 first replies
4 Jay@ManhattanReview 40 first replies
5 Rich.C@EMPOWERgma... 26 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

### Most Active Experts

1 Scott@TargetTestPrep

Target Test Prep

199 posts
2 fskilnik@GMATH

GMATH Teacher

163 posts
3 Brent@GMATPrepNow

GMAT Prep Now Teacher

119 posts
4 Max@Math Revolution

Math Revolution

92 posts
5 GMATGuruNY

The Princeton Review Teacher

72 posts
See More Top Beat The GMAT Experts