The area under the speed time graph given the total distance covered by car. What is the average velocity to two places of decimals?

A.
17.72 meter/sec. 
B.
21.67 meters/sec 
C.
2.5 meter/sec. 
D.
20.45 meters/sec. 
E.
13.33 meter/sec.
Correct Answer: Option D
Explanation
Time(sec) areas of the three sides are (frac{1}{2}) x 2 x 20 = 20 x 2 = 40
(frac{1}{2}) x 4 x 20 = 40
40 + 40 = 80
vel. = (frac{80}{4})
20 + 0.45 = 20.45 meter/sec.