Question: The total distance traveled by a car moving in a straight line is as follows: After the first 7.0 minutes it has gone a total of 2.0 miles. After 14.0 minutes it has traveled a total of 4.5 miles. Finally at 21.0 minutes it has traveled a total of 6.0 miles.
Question: Find the average speed at given time:
A: 7 minutes:
B: 14 minutes:
C: 21 minutes:
Show all work, use additional paper if necessary for determine the average speed.