This is one of the coolest planetary-astronomy animations I've found:

Space Explorer Mike on Twitter

Now consider the size of the planets, and imagine Jupiter's and Saturn's "surface" speed. "Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour."

Ah! Found it! "Taking Jupiter as an example, it is about 11 times the diameter of Earth. It rotates on its axis in about 10 hours, about two-and-a-half times faster than Earth. This means that the equatorial surface of Jupiter moves at about 25 times the speed of Earth's equatorial surface. (...)"

"(...) That means that the portion of Jupiter that we see, at the equator, is traveling at around 25,000 miles per hour!"

What's interesting to watch is Terra and Mars. There's one spot where you can line up one of the continental coasts with a dark feature on Mars as a marker, and watch how they barely move apart.