A blimp has an air speed of 10.00m/s. The pilot takes the blimp on a trip 5000m[S] directly into the wind and then 5000m[N] back with the wind. The total time as 20.0 minutes(assume that the turn-around time is negligable). Determine the velocity of the wind relative to the ground.
Any help would be great I have no idea how to do this thanks :)