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 sixth 8-minute interval, what was the average speed of the car, in miles per hour, in the first 8 minute interval? Choose the most appropriate option.
A) 30  B) 34  C) 38  D) 42  E) 46
(3.6 miles / 8 minutes)*60 minutes/hour = 27 mph   Let x be the original speed.   x - 5(3) = 27   x = 42 mph   The answer is 42.
<result>D</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 sixth 8-minute interval, what was the average speed of the car, in miles per hour, in the first 8 minute interval?