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## Official Guide Explanation:Problem Solving #168

Background

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Quantitative Review (2nd ed.). Click the links on the question number, difficulty level, and categories to find explanations for other problems.

These are the same explanations that are featured in my "Guides to the Official Guide" PDF booklets. However, because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

Question: 168
Page: 84
Difficulty: 6 (Moderately Difficult)
Category 1: Arithmetic > Ratio and Proportion >
Category 2: Arithmetic > Fractions >
Category 3: Word Problems > Rate Problems > other

Explanation: Since flights leave A every hour and take 2(1/2) hours to reach their destination, they arrive on the half - hour, starting at 10:30. Flights leave B every 20 minutes, so no matter what hour the passenger arrives, the passenger will only have to wait 10 minutes before getting on a flight at forty minutes past the hour. If she departs at forty minutes past the hour, she'll arrive 1(1/6) hours (one hour and ten minutes) later, at fifty minutes past the next hour. Flights only leave C at 45 minutes past the hour, so she'll have to wait 55 minutes. Total wait? 10 + 55 = 65 = 1 hour, 5 minutes, choice (B).

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