The distance in kilometers between Shanghai and Wahun? What time by air or bullet train? Which best?

There is about 850km between the two cities by road.
The bullet trains takes about 6 hours. The flight takes about an hour and a half.
If you want to be fast but do not the money affairs, the flight is the best method. If you want to be fast as well as much cheaper method, the bullet trains are much better.
In my opinion, I will choose the bullet trains, which is comparatively cheap and I can also enjoy the beautiful scenery outside.

I am very pleased with these answers and am very happy to give the editors and staff a 'pat on the shoulder'! Thank so much.