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 38 miles per hour, how many miles did the car travel in the third 5-minute interval?
Choose one:
A) 1.0 B) 1.5 C) 2.0 D) 2.5 E) 4.0
In the third time interval the average speed of the car was 38+5+5=30 miles per hour;   In 5 minutes (1/12 hour) at that speed car would travel   48*1/12= 
<gadget id="calculator">  48*1/12</gadget>
<output>4</output>
4 miles.   Answer: 4.0.
<result>E</result>
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 38 miles per hour, how many miles did the car travel in the third 5-minute interval?