Fill in the response. See the 2 person dialog:
[x]. when is it illegal to ride a bike on a footpath.
[y]. In Victoria and New South Wales cyclists can only ride on a footpath if they're under the age of 12 or supervising a child under 12, or have a disability which restrains them from being able to ride on the road..
[x]. what about in queensland.
[y]. 
In Queensland cyclists can ride on any path as long as there isn’t a sign stating otherwise.