Word problem.

[Rainbow]

This is what my question says :

An airplane makes a 990 km flight with a tailwind and returns, flying into the same wind. The total flying time is 3 hours 20 minutes, and the airplane's speed in still air is 600 km/h. What is the speed of the wind?

 

[HallsofIvy]

Let the speed of the wind be "V". Flying with the tail wind, the plane's speed is 600+ V, against it, 600- V.