Having a hard time understanding the vehicle movement in Jovian Chronicle 2e. Can anyone help me?

First time trying to learn a TTRPG by myself. I don't quite get how the mecha movement works, nor where exactly it explains it in the SilCORE book.

I understand, for player movement, you take 25+(5*athletic), and then divide it by a value according to which type of movement you're performing. However, for the mechs and ships, it shows me the vehicle's walking speed (i.e. 35 KPH), and also an equation such as:

WALK 5/10 SPACE 15/30

But both of those just come down to 1/2... I don't get it. Can someone help me understand? Is there another resource which might help me better? I feel like I'm trying to figure out a school book...