A certain aircraft can fly 960 miles with the wind in 4 hour

A certain aircraft can fly 960 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. What is the speed of the wind?

D=RT
T=D/R
4=960/R
4R=960
R=960/4
R=240MPH WITH THE WIND
6=960/R
6R=960
R=960/6
R=160 MPH AGAINST THE WIND.
(240-160)/2=80/2=40 MPH IS THE WIND SPEED.
PROOF:
240*4=160*6
960=960