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A certain car increased its average speed by 5 miles per

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by AAPL » Wed Aug 15, 2018 7:04 am
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A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?

A. 1.0
B. 1.5
C. 2.0
D. 2.5
E. 3.0

OA D.
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by bubbliiiiiiii » Wed Aug 15, 2018 12:17 pm
Speed in 3rd mile = 30 mph. => d = 30 mph * 5/60 = 2.5 miles
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by Scott@TargetTestPrep » Sun Aug 26, 2018 5:55 pm
AAPL wrote:Official Guide

A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?

A. 1.0
B. 1.5
C. 2.0
D. 2.5
E. 3.0
The rate of the car in the first interval was 20 mph, in the second it was 25 mph, and in the third it was 30 mph.

Since 5 minutes = 5/60 = 1/12 hour, the distance traveled in the third interval was 30 x 1/12 = 30/12 = 5/2 = 2.5 miles.

Answer: D

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