On a map with a scale 1:100,000 the distance between two cities is 12cm. what would be the distance between these two cities on a different map with a scale 1:300,000?

First scale is 1 - > 100,000 each centimeter in map represent 100,000 in the real world. If you have 12 cm, in reality the distance is (12 cm) (100,000)

12 cm - > 1 200 000 cm, each m = 100 cm

Distance: 1 200 000 cm / 100 cm/m = 1 200 m

Distance: 1 200 m / 1000 m/km = 1,2 km

Second scale is 1 - > 300,000 each centimeter in map represent 300,000 in the real world. If you have 12 cm, in reality the distance is (12 cm) (300,000)

12 cm - > 3 600 000 cm, each m = 100 cm and each km = 1000 m

Distance: 3 600 000 cm / 100 cm/m = 3 600 m

Distance: 3 600 m / 1000 m/km = 3,6 km

300 000 is three times 100 000

The real distance is three times. first case 1,2 second case 3,6

Your anwer is 3,6 in kilometers, 3 600 in meters or 3 600 000 in cm