The average speed of a car decreased by 3 miles per hour every successive 8-minutes interval. If the car traveled 3.6 miles in the seventh 8-minute interval, what was the average speed of the car, in miles per hour, in the first 8 minute interval?  Answers.
A) 33
B) 36
C) 39
D) 42
E) 45
(3.6 miles / 8 minutes)*60 minutes/hour = 27 mph   Let x be the original speed.   x - 6(3) = 27   x = 45 mph   The answer is 45.
<result>E</result>
The average speed of a car decreased by 3 miles per hour every successive 8-minutes interval. If the car traveled 3.6 miles in the seventh 8-minute interval, what was the average speed of the car, in miles per hour, in the first 8 minute interval?