If you monitor Saturn's atmosphere and you see a storm at a longitude of 0° west on one day and at a longitude of 90° west 3 days later, what is the average wind speed on Saturn at this storm's latitude? Note that these positions are measured on a coordinate system that rotates with the planet's interior. (The radius of Saturn is 6 ´ 107 meters.)
a. 720 m/s
b. 120 m/s
c. 360 m/s
d. 540 m/s
