How to do Relative Motion problems: Getting across a moving river

Relative motion has to do with multiple objects moving with respect to one another, and trying to think about how it all looks depending on what point of view different observers have when watching the objects.

A classic example of this is trying to get a boat across a flowing river, without being pushed off-course or downstream. How is this done? This is the same problem as trying to fly a plane when the wind hits it from the side, or a bird trying to fly on a windy day. What do you have to do to the boat, airplane or bird in order to not be pushed off-source?!

Check out this video to see how to use basic vector rules with the velocity vectors involved in the problem!