7x9 = 63
63x2 = 126
126 is the surface area
Noelle goes east at N mph.
Karina travels west at N + 9
then their velocity between them is (N + N + 9)
After 8 hours they travel 8(2N + 9) = 232
(2N + 9) = 29
2N = 20
N = 10 mph for Noelle
N+9=19 mph for Karina
You multipy 7/8 and 6 and then simplify if needed to get how long it will take
