A small plane takes off and heads directly upwind to an airport 40 miles away. It takes 30 minutes to get there. The return flight takes 20 minutes. What is the speed of the wind?

Question

This is for my math review packet and I don't really understand how I can solve it.

Answer 1

There

40 = (r - w)(0.5)

Back

40 = (r + w)(1/3)

80 = r - w

120 = r + w

Can you solve for r and answer?