Hi
Let x and (x-92)represent the rates each of the jets are traveling
Question states*** D= r*t
9x + 9(x-92) = 10,602mi
Solving for x
18x = 10602+ 825
18x = 11430
x = 635mph. The other jet traveling at 543mph. (635-92)
CHECKING our Answer***
9hr*635mph + 9hr*543mph = 10,602mi