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.

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.

anonymous · Answer

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).