A car was initially traveling at an average speed of 36 miles per hour. During each of ten successive 5-minute intervals, the car decreased its average speed by 2 miles per hour. How many miles did the car travel in the fourth 5-minute interval?	Choose the correct option:
A) 1.32	B) 5.32	C) 4.56	D) 2.33	E) 1.44
The question does not specifically mentioned whether 36miles/h is the speed in first interval or before that... So I got confused.   If former is the case, then average speed of the car in 4th interval will be 28. This gives 28 * (5/60) = m = 2.33 miles   correct option is 2.33
<result>D</result>
A car was initially traveling at an average speed of 36 miles per hour. During each of ten successive 5-minute intervals, the car decreased its average speed by 2 miles per hour. How many miles did the car travel in the fourth 5-minute interval?