Suppose an object starts at time t = 4 s at a position defined as x = 9 m. At t = 18 s, the object is at x = 10 m. What is the average velocity of the object (in m/s) for the interval?

a. 0.06 m/s
b. 0.07 m/s
c. 0.08 m/s
d. 0.09 m/s