Klostu or longwe, if you end up in rural PNG, you will have problems when seeking info on trip time and distance because the idea of a kilometre or an hour is difficult to explain, unless of course the person is schooled, then he'll say its about 5km, will take about 45 minutes, etc. Scale and distance can be tricky.
I had a hard time trying to explain 20m of sea depth and had to use a 20m tall coconut to clarify things.
Like health workers somewhere used bamboo shoots to demonstrate the use of condoms as contraception and you know how the story ends Ralph. Yes, they went home all right, affixed the condoms on bamboo shoots and the kids kept on coming. Cheerio.