Thanks, My friends!
When does relative movement make mathematical and physical sense at the same time?
With only three elements, this is impossible, ie:
1 - Reference frame (the frame of the figure shown above) or inertial observer point;
2 - Movement of the red particle;
3 - Movement of the green particle.
This has been discussed in previous posts.
But this problem can change if a fourth moving element enters the frame, for example: wind or sea current.
The travel time of a ship depends on the direction of the sea current. The sea current may be related to the seafloor, or Mach Relational Referential.
An airplane may be moving in relation to the ground, but will have its support affected in accordance with the wind direction, also related to the ground. Idem, Mach Relational Referential.
The bed of the sea and the earth ground serve as absolute reference, so that the movement of the ship and the airplane can be explained by physics and mathematics without conflict.