In a storm, a plane flew against the wind and took 9 hours to cover 3,600 miles. The return trip, traveling with the wind, took 1 hour less. find the air speed of the plane, and the speed of the wind.

Answer 1

Speed of plane --- x mph
speed of wind ---- y mph

9(x-y) = 3600
x-y = 400

8(x+y) = 3600
x+y = 450

add them:
2x = 850
x = 425 , and y = 25