How far in miles from Chongqing to Changsha, and what's the best way to travel from one to the other

Hi, it's about 1200 km (746 miles) from Chingqing to Changsha.
The best way depends on your demand, for money-saving or for time-saving. From Chongqing to Changsha, you can take a train or catch a plane. The former way takes about 20 h nad costs about CNY150 for hard seat, CNY 280 for hard sleeper and CNY 430 for soft sleeper. And the latter costs about CNY 650-860 and you can arrive at Changsha in about 1-1.5 h.