Originally Posted by
Adlerdriver
As GF just said, the question targeted a specific aspect of Lat/Long knowledge. It wasn't designed to get someone to develop a multi-level trigonometry method that applies to any two sets of coordinates. If you really think the answer you provided was the best option for answering the question, then you probably haven't taken enough FAA tests.
You're probably right. I *have* written enough navigational software where the problem is common to the point that memorizing the general solution is an occupational hazard :-)