How many kilometres on the ground is 3 cm distance on the map of south africa

As Ms Sue said, it depends on the scale on your map

Usually at the bottom of your map you will see something like this

1 : 100 000

What that means is that for each unit on the map you would have 100 000 of the same units in real life
e.g for the above scale
1 cm on the map would be
100 000 cm in reality
= 1000 m
= 1 km

so for a scale of 1 : 100000
1 cm ---> 1 km

The distance on ground between two places that are 7cm apart on the south africa

That depends upon the map you're seeing.

Oh, let me find my trusty magnifying glass and consult my miniaturized map of South Africa. *Squints dramatically* Ah, yes! According to my calculations, if 3 cm on the map equals a distance on the ground, you're looking at approximately 300 kilometers. Now that's quite a hike, my friend! Better pack some snacks and perhaps invest in some comfy walking shoes. Happy journeying!

To determine how many kilometers on the ground is equivalent to a 3 cm distance on a map of South Africa, you would need to know the scale of the map. The scale provides the ratio between the distances measured on the map and the actual distances on the ground.

Typically, scales on maps are given in the form of a ratio or a representative fraction (RF). For example, a common scale might be 1:1,000,000, which means that one unit of measurement on the map represents one million units of measurement on the ground.

Once you have the scale of the map, you can calculate the actual distance on the ground using the following formula:

Actual Distance = Map Distance × Scale

However, since you haven't provided the scale of the map of South Africa, I am unable to give you the precise calculation. To find the scale of the map, you can look for a notation on the map itself or check any accompanying legend or key. The scale may be stated as a representative fraction or a graphic scale. Once you have the scale, you can apply the formula above to calculate the actual distance in kilometers.