1. The problem statement, all variables and given/known data Two boats leave a dock at the same tie. One goes south at 30 km/h and the other goes southwest at 40 km/h. What is the rate of change of the distance between the 2 boats, 30 minutes after they leave? I know how to do these questions when it's a right triangle...but since this has one boat going south, and one going southwest...I don't know how to do it.