Question

It takes 6 hours for a plane to travel 720 km with a tail wind and 8 hours to make the return trip with a head wind. Find the air speed of the plane and the speed of the wind current.

Answer 1

I already have part of the answer done. I have found the equation for the tailwind and the headwind.
Tailwind: \[720=6r\]
\[120=r\]
Headwind: \[720=8r\]
\[90=r\]

I do not know how to insert/apply the air speed (A) and the wind speed (W).