Find the distance between cities A and B if the distance between them on the map is 3.4 cm

Find the distance between cities A and B if the distance between them on the map is 3.4 cm and the scale of the map is 1: 3,000,000.

We take the distance between cities on the map, which in the condition is 3.4 cm and multiply by the scale, which we get in cm (3.4 cm * 3,000,000 = 10,200,000 cm)
Next, we translate the resulting number of centimeters into meters, according to the well-known formula: 1m = 100 cm (10,200,000 cm = 102,000 m)
As a result, we convert the resulting number of meters into kilometers, according to the well-known formula: 1 km = 1000 m (102 000 m = 102 km)
3.4 cm * 3,000,000 = 10,200,000 cm = 102,000 m = 102 km

As a result, we get the answer: the distance between cities A and B is 102 km