Check you APV valves.. They can get gummed up and cause poor performance.
800 kph = 497.1 mph
800 miles divided by 60 mph = 13 hours 20 minutes for the trip if you average 60 mph.
It would take 53 hrs. 20 mins. to travel 800 miles at 15 mph.
700-800 mph
Most of the time they go at about 600 mph, although they can go up to 800 mph as well. Yep, about 0.85 for the 777-300ER and A380-800
800 miles/2.5hours = 320 mph
135 mph
around 75 mph
590 mph
It can go 55 mph
around 75 mph
That will depend on the speed you are traveling with. At 60 mph= 88 feet/sec = 9.09 sec = 800 feet at 70 mph= 102 feet/sec =7.84 sec = 800 feet