It depends on how created them.
If you manually created them, then you used keyframing to build the motion paths. Then it's as simple as opening the Properties panel and moving the keyframe points further apart.
If you used an effects preset to create your motion paths, you can change the speed the same way -- moving the keyframe points further apart. But, if you don't understand keyframing, that may not be as intuitive.
Again, just open the Properties panel for the clip (right-click on it and select Show Properties), then click on the Show Keyframes button to open the Properties panel time, then move the keyframe points for Motion further apart.
I have a free article on Basic Keyframing, available on Premiere Elements support site http://Muvipix.com. Just type "keyframing" in the product search box.
I also cover the process, step by step, in my books, available on Amazon and at the Muvipix store.
Thanks for the answer, Steve. I still need some more tutoring, and have ordered your book. I think I'll find a lot of answers there.
Thanks for supporting the book, Confused!
After you get it, you'll need to change your logon name!