For the UAV: I have been practicing the UAV trick once a day and timing myself always go accuracy first rather than speed, I would just practice over and over.
For practicing with the joystick you can buy one on amazon from thrust master for not to bad of a price. Practicing flight SIMS will help. If you can not afford the joystick then perhaps try playing FPS games with inverted controls. You can get Aim Lab on steam for free to practice target tracking.
For the train question your formula will be RT=RT (R being the rate or speed) and (T being the time) So just replace what variables you have with the appropriate numbers, and for what is left use X, then just solve the formula like a regular algebra problem.
What creates wind vortices? are you referring wing tip vortices? then this may be helpful;
https://en.wikipedia.org/wiki/Wingtip_vortices
Also the the FAA handbook will be a good resource.
The A10 would probably be the answer for what plane would be the best for a tank on the ground.
Hope that helps