First we calculate radius of satellites orbit. it is:
R = 6400 + 4700 = 11 100 km
Now we need to calculate perimeter of its path.
P = 2Rpi = 69473 km
Since satelite travels that distance in 5 hours that means that in 1 hour he will travel one fifth of it.
answer is 69473/5 = 13949 km