Bunuel wrote:

In driving a round trip from City A to City B, a motorist drives to City B and, on the way back to City A, by the same route, stops at a service station at a location that is 10 percent of the distance to City A from City B. When the motorist stops at the service station, what percent of the round trip is completed?

(A) 40%

(B) 45%

(C) 55%

(D) 60%

(E) 65%

City A to B is 50% of the total journey.

City B to A is 50% of the total journey.

10% of City B to A is 10%*(50%) = 5%

Percent of round trip completed is therefore 50% + 5% = 55%

Hence

option C = 55% is the answer.

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