The question has been answered. Your inability to comprehend does not in any way affect that. I will attempt to help you understand, but it will take effort on your part.
Sam and Fred are on a merry-go-round, which is spinning clockwise at 15 mph. Sam walks at 3 mph from point A around the edge of the merry-go-round to point B. Fred travels the same path at the same speed, but in reverse, from point B to point A. If they start at the same time they will arrive at the same time, even though the merry-go-round is spinning in only one direction.
This is something you can try for yourself if you don't believe it.
What you need to understand is that the Earth and its atmosphere are the merry-go-round. I will attach a diagram to help explain.