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Last Updated on May 10, 2023
GMAT OFFICIAL GUIDE PS
Solution:
We can let the distance to the center = d, so the roundtrip distance = 2d.
Since the technician has driven to the center and completed 10 percent of the drive home, he has gone d + 0.1d = 1.1d. Thus, the percent completed is:
(1.1d)/(2d) x 100
11/20 x 100 = 11 x 5 = 55 percent.
Alternate solution:
After the technician has driven to the center, he or she has completed half, or 50%, of the round trip. We know that the technician will drive a bit more, and without doing the math, we see that the only logical answer choice is 55%.
Answer: E
