1) The distance between Hans Solo and Darth Vader's spaceships is changing as they move, with their distances from the origin also changing over time. 2) When Darth Vader's ship is 1200 km from the origin and Hans Solo's ship is 500 km from the origin, the distance between them is decreasing at a rate of 15.4 km/min. 3) Related rates problems involve relating the rates of change of variables that depend on one another, like the distances between the spaceships in this scenario.