How do I keep flash moving at the same speed?

Hello again guys!

I’ve managed to LEARN a lot about the flash program. I think I can finish this animation on my own (pretty much got the grasp of it). However, I still have one small problem. When I’m making my sidewalks/houses move, they all move at different speeds and collide with each other. Everything that is moving at this part of the scene is set at 10 frames (pasted 10 times to make the “loop” effect). How can I make everything move at the same speed, so the houses/sidewalk don’t collide/overlap when they are moving?

Any help would be greatly appreciated!

Thank you all so much,


P.S. I’ve attached my updated flash file again if it can be of some use.

Password: kirupa