"At t = 0, a single-engine military jet is flying due east at 12 mi/min. At the same altitude and 208 mi directly ahead of it, still at t = 0, is a commercial jet, flying due north at 8 mi/min. When are the two planes closest to each other? What is the minimum distance between them?"
I already have the answer, verified by the text, but had to do some unkosher gymnastics to arrive at the answer.