800 km per hour
b
840
We can only tell average speed from those two pieces of information. 3,000 miles in 5 hours equals an average speed of 600 mph.
The plane travels 1260 km in 3.5 hours. It therefore travels 1260/3.5 = 360 in 1 hour. The plane's velocity is 360 kph. In real life there may be a headwind which would reduce the speed or a tailwind which would increase the speed of flight.
50km per hour
Assuming that the car moves at a constant speed, you can use the standard formula for speed: distance = speed x time
840
It takes approximately 8 hrs
14 hrs
15 hrs in plane
bout 8 hrs
About 4 hrs by plane
16 hrs
9 hrs
6 hrs.
4 hrs
7 hrs
maybe about 1.5 hrs max