Needs to be more complicated. Probably a quarter of high school seniors would get that in 10 seconds.
The sad part is, I had Calc I in high school, sucked at it, then had Calc I again in college (which I finally went to about 5 years after high school) , then Calc II, then Differential Equations. Thanks to my good homework grade, I got Bs in Calc I and II. Diff Eq. was only tests and quizzes. It was my only C in college, and a
very solid one: 75%. Mathematical sorcery!!!
Now a few years later, I couldn't remember how to integrate over an interval. I got to the 1/2 * x^2 part, and then didn't know how to continue. KMc's post was helpful in that regard. I guess that's bound to happen though, since I've not had any need to use integrals or differentiation ever since then.
And of course, years later, it's finally started to "click" with respect to the ways that calculus is reflected in the real world, instead of purely abstract concepts about new ways to torture and torment numbers and variables.