Posted 9/22/2012 19:05:00

I nerd-sniped myself a bit on the first of the two questions on the exam. I calculated that the trains would meet after 2 hours and 13 minutes, about 10 miles north of Ardmore, and then found the location on Google Maps. The railroad runs a couple miles east of I-35, and the spot where the trains would meet is around its crossing with state route 53.

In terms of physics, the second question is actually more interesting. It's a question commonly given in classical mechanics courses, though it might be a bit above these students' heads. For those who aren't physicists or don't want to work through the math, the answer is about 42 minutes, and that the time is the same regardless of where you drill the hole to.