EDIT: Whoops! I just realized the entire point of this problem was missed, and it's my fault -- I worded my comment pretty poorly in hindsight. I meant to say

EDIT: Whoops! I just realized the entire point of this problem was missed, and it's my fault -- I worded my comment pretty poorly in hindsight. I meant to say that STEM college graduates ought to be able to solve problems such as this one. That would include less-trivial instances, like the light-ray example I gave in another comment where you have to find the path that light travels when it crosses between media with different velocities. Unfortunately I made the mistake of posing the most trivial instance of this kind of problem as an example (Euclidean vector space), which resulted in many people missing the point I was trying to make. Sorry about that. The point wasn't solving this specific problem, the point was this kind of problem, and my example was overly simplified and therefore not representative of what I was trying to convey. With that aside, note that this is still not a basic geometry problem, since you need to be able to discuss the lengths of arbitrary smooth curves, not just lines/angles/circular arcs.