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In driving a round trip from City A to City B, a motorist drives to Ci

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In driving a round trip from City A to City B, a motorist drives to Ci [#permalink]

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New post 13 Apr 2018, 03:36
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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%

The OA will be automatically revealed on Friday 20th of April 2018 03:36:20 AM Pacific Time Zone
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In driving a round trip from City A to City B, a motorist drives to Ci [#permalink]

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New post Updated on: 13 Apr 2018, 06:35
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.

Give me +1 Kudos if you like the explanation. Thanks.
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Originally posted by houston1980 on 13 Apr 2018, 03:43.
Last edited by houston1980 on 13 Apr 2018, 06:35, edited 1 time in total.
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Re: In driving a round trip from City A to City B, a motorist drives to Ci [#permalink]

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New post 13 Apr 2018, 04:20
Let the distance between A & B be x, so total distance to be covered = 2x.
Now, the stop takes places at a location that is 10 percent of the distance to City A from City B = 0.1x
Hence the percent of the round trip is completed = (x+0.1x) / 2x *100 = 1.1x/2x *100 = 5.5*100 = 55%
Re: In driving a round trip from City A to City B, a motorist drives to Ci   [#permalink] 13 Apr 2018, 04:20
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In driving a round trip from City A to City B, a motorist drives to Ci

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