The distance between the east and west coasts of Australia are almost exactly the same as that between the east and west coast of the contiguous USA.
We're split into only three time zones though (in summer there are four as some eastern states don't observe daylight saving). If it were midday in Sydney on the east coast, it would be 11:30am in Adelaide (in the middle on the coast of the Great Australian Bight) and 10:00am in Perth on the west coast.
Both countries are almost exactly the same size (excluding Alaska) but we only have six states and two territories. So the state of Texas (that's the biggest in the lower 48 isn't it?) compares thusly:
Western Australia = ~4 times the size of Texas
Queensland = ~3 times the size of Texas
Northern Territory = ~2 times the size of Texas
South Australia = ~1.5 times the size of Texas
New South Wales = ~1.2 times the size of Texas
Victoria = ~35% of Texas
Tasmania = ~13% of Texas
Australian Capital Territory = ~0.35% of Texas.
The time zones are:
NSW, Queensland, ACT, Victoria and Tasmania = midday.
South Australia, Northern Territory and the town of Broken Hill in the west of NSW = 11:30am
Western Australia = 10:00am.
Thus endeth the lesson for today.