A few years back a much more complex problem was posed in a recruiting advert.
IIRC it involved a F4 at Coningsby, an intruding Badger bound for Boulmer and a tanker out of Marham. A solution was a supersonic intertcept by the F4, a link with the tanker etc. While many of us came up with an effective answer there was one solution that effected the intercept even quicker.
If you got it right you were well on the way to being a fighter controller.