Iroquois
The Iroquios were a nomadic people. They needed to have a good idea how long a journey might take.
You can walk at 4kmph on good track, and 3kmph on rough track.
1
If you travel 4 km on good track how many hours will it take you?
2
If you travel 10 km on good track how many hours will it take you?
3
If you travel 9 km on rough track how many hours will it take you?
4
If you travel 15 km on rough track how many hours will it take you?
5
If you travel 3 km on rough track, and 8 km on good track how many hours will it take you?
6
If you travel 10 km on good track, and 6 km on rough track how many hours will it take you?