(This exercise is a continuation of Exercise 1.)

(a) About how long does it take for the Sun-Jupiter center of mass to move from 
one side of the system to the other?

(b) What would be the average velocity of the center of mass as Jupiter moves from 
the near side of the system to the far side?  Express your answer in units of 
kilometers per second.

(c) How fast is this motion, compared to the running speed of a typical human 
being?