Flight Narita International Airport departs from Tokyo Narita International Airport at 11:45 and arrives at Mumbai Chhatrapati Shivaji International Airport at 18:35.
The flighttime is about 10h 20m. The distance travelled ("as the bird flies"): 7441 Km. So the average speed is roughly 720 Km.
There is an 3.5 hour time difference between Tokyo and Mumbai