Anyway, I am reminded of a question from back then, that seemed to have an obvious answer to me, vertical, but did not really make sense. If an electric train is travelling at 80km/h in one direction, 50 mph in the old money, and the wind is coming in the precisely opposite direction at 80km/h, 50 miles per hour, in which direction does the smoke from the train engine blow? The young me said vertically, but I am not so sure now and I can't remember what the correct answer was. The same could apply to ships at sea, and I've seen smoke from ships out in the bay going one direction or the other, especially the Spirit of Tasmania ferry.
Is your brain or maths better than mine? If you know the correct answer, make a note of the time and please hold off for a bit and see what other people say.