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Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles

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by BTGmoderatorDC » Sat Jun 25, 2022 7:05 pm
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Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?

(A) 5
(B) 8
(C) 10
(D) 15
(E) 24


OA A

Source: GMAT Prep
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Re: Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 mile

by swerve » Mon Jun 27, 2022 9:45 am
BTGmoderatorDC wrote: ↑
Sat Jun 25, 2022 7:05 pm
 Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?

(A) 5
(B) 8
(C) 10
(D) 15
(E) 24


OA A

Source: GMAT Prep
distance \(=\) rate \(\cdot \) time

distance / rate \(=\) time

\(\dfrac{8}{55} \cdot 60=\dfrac{96}{11}=9\) minutes

\(\dfrac{8}{35}=\dfrac{96}{7}=14\) minutes

\(14-9=5\) minutes

Therefore, A
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