Answer
The magnitude of the average velocity is $~~0.146~m/s$
Work Step by Step
Between January 26, 1977 and September 18, 1983, there were 2427 days (including the start day and the end day).
If we assume that walking began at noon on the first day and ended at noon on the last day, we can say that there were a total of 2426 days.
We can express this period of time in units of seconds:
$t = (2426)(24)(3600~s) = 209,606,400~s$
We can find the average velocity:
$v_{ave} = \frac{\Delta x}{\Delta t}$
$v_{ave} = \frac{30,600,000~m}{209,606,400~s}$
$v_{ave} = 0.146~m/s$
The magnitude of the average velocity is $~~0.146~m/s$.
