The air speed is the same for both trips and the wind speed is also the same. Plug the distance into the formula. Where a is acceleration v is the final speed.
Wait a few minutes and run the test again.
When determining the rate of speed formulas the rate is equal to the distance over time. If distance was measured in miles and time in hours then output will be in miles per hour mph mih and so on for kmh ms etc. The air speed is the same for both trips and the wind speed is also the same. You can easily calculate average speed having time and distance given in different units of lenght eg.