Yes, the question is obvious. And yes, it can be answered via 10-20 minutes of RTFM. But, the value of Stack Overflow is that it replaced 10-20 minutes of RTFM with a simple answer.
So, don't knock the RTFM questions on Stack Overflow. That's part of its value to the greater community.
(I must admit that I've answered very few Stack Overflow questions because every time I find an answer. I did take the time to write out a well-written answer for an obscure problem, and it got me plenty of points. It's nice that the community has a 1000x ROI, too.)