I remember having this exact same problem when I was 17 (in the USA). Phrased slightly differently, but the main difference was that we weren't given the formu

I remember having this exact same problem when I was 17 (in the USA). Phrased slightly differently, but the main difference was that we weren't given the formula. We were given the land speed and the water speed. Find the fastest route. I don't remember anyone crying over it.