Two planes leave New Orleans at the same time. Plane A heads north and Plane B heads south. After 3 hours and 30 minutes, the two planes are 3846.5 miles apart. Also, Plane A is traveling 49 mph faster than Plane B.
speed of plane B ---- x mph
speed of plane A ---- x+49 mph
The fly in opposite directions, so ....
3.5x + 3.5(x+49) = 3846.5
solve for x and state your conclusion