On the road map, some road junctions are marked with a circle with a diameter of [[$ 1.8 $]] mm. What diameter of the intersection does this actually correspond to when the scale of the map is [[$ 1:200 000 $]]? If the diameter of the intersection area is actually [[$ 25 $]] m, then how large should it be on that map? (Source: Finnish matriculation exam spring 2001)



Answer:
The diameter of the intersection area is actually m.
If the diameter was [[$ 25 $]] m in real life, it would be mm on the map