Forgive me if this is deemed a "homework question", b/c it kinda is, but I'm thinking about it a little differently... It's a 3 dimensional calc. III problem, that I've broken down to this: Essentially there's an "enemy ship" traveling in a straight line at a constant velocity. I'm stationed at the origin and I want to fire at the ship (I know the speed the missle will fire at). So how do I determine at what angle to fire the missle so that it hits the moving target? I know it really boils down to a simple physics equation that I should remember from a million years ago..but, I don't... HELP!