Depends on the city,there are three time zones.
10:30
Tasmania, Australia is 10 hours ahead of Coordinated Universal Time (UTC+10).
Australia has several time zones, so it depends on what part of Australia you are referring to. Western Australia is GMT +8 hours. The Northern Territory and South Australia is GMT +9.5 hours. The east coast including New South Wales, Queensland, Tasmania and Victoria is GMT +10 hours. So Australia is 8 to 10 hours ahead of England (Daylight savings not taken into account.).
Texas and Australia are both pretty big places, so the precise cities can make a few hours difference in flight time.That said, a direct flight from "Texas" to "Australia" would be somewhere in the vicinity of 18 hours, if you could get one (most of the time you will have at least one stop, which will likely add several more hours to the flight).
Australia is 9 hours ahead of Norway.
Five and a half hours. See the Related Link.
Spain is 8 hours behind Australia
12 hours
2 hours
10 hours
Australia is ahead of India by anywhere from 2 and a half to 5 hours, depending on where in Australia you go to.