The length of the line is measured on a map with a scale of 1 50000. It is equal to 12.8 cm.

The length of the line is measured on a map with a scale of 1 50000. It is equal to 12.8 cm. How long is this line on the ground?

In the condition, the scale itself is somewhat incorrectly written. In the correct form, it should be designated as “1: 50000”. This scale means that one centimeter on the map represents 50,000 centimeters on real terrain. 50,000 centimeters is 500 meters.

Thus, we have that 12.8 centimeters will be:

12.8 * 500 = 6400 = 6.4 kilometers.

We get an answer equal to 6.4 kilometers