Question

A map has a scale of 5cm=20km. If two cities are 17 centimeters apart on the map what is the actual distance between the two cities to the nearest tenth of a kilometer

Answer 1

5cm/20km = 17cm/x km

cross multiply:
5x = (20)(17)

solve for x.

Answer 2

Use this proportion. Cross multiply and solve for x.

5/20 = 17/x

5x = 340
x = 68.0