check this out:
http://voyager.jpl.nasa.gov/multimed...gerModule.html
Also, I think I have worked out the speed difference Suzy. Voyager 1 is flying away at a different angle to Voyager 2.
Earth must be currently moving away from Voyager 1's direction on it's way around the Sun.
But not moving away from Voyager 2's direction as fast.