I am not exactly sure how to go about solving the following question. I made a drawing to help visualize the problem and thought about assuming just for the sake of this problem that one car is stationary while the other is driving, so I will be able to fit the two cars onto the same drawing, and thus make the problem somewhat more clear.
However, I am really lost, and I don't really know how to approach this question as I find there's too much information that needs to be used, which is quite overwhelming.
Here's the question:
Two cars travel on parallel “north-south” roads that are 2km apart from each other. The first car is traveling north on road #1 at a speed of 20km/h. While the second car is traveling south at a speed of 60km/h. How fast is the distance between them changing, when the distance between them is 8km?
Furthermore, are there any general strategies that can be applied to questions of such nature? What would be an effective way to become comfortable with solving such questions.
Any help would be greatly appreciated!