Flight Narita International Airport departs from Tokyo Narita International Airport at 18:45 and arrives at Wuhan Wuhan Tianhe International Airport at 22:00.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 2928 Km. So the average speed is roughly 689 Km.
There is an 1 hour time difference between Tokyo and Wuhan