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Last Updated on May 11, 2023
GMAT OFFICIAL GUIDE PS
Solution:
Let t represent the time passed between the departure of Al (11:00 a.m.) and the retrieval of data by the dispatcher. Since Ben left at 8 a.m., his time is (t + 3). Since they both traveled for a total 240 miles, we can use the formula distance = rate x time and create the following equation:
Ben’s distance + Al’s distance = 240
20(t + 3) + 40t = 240
20t + 60 + 40t = 240
60t = 180
t = 3 hours
Thus, it was 11 a.m. + 3 hours = 2 p.m. when the dispatcher retrieved data from the vehicle tracking system.
Answer: B
