Scale Drawings for accelerated math

Question

5. The scale of a map says that 4 cm represents 5 km.

a. What distance on the map (in centimeters) represents an actual distance of 4 kilometers?

answer: 3.2

I just need the answer to B:

b. What is the actual number of kilometers that is represented by 5 centimeters on the map?

Answer 1

x/5 =5/4

x=25/4

x = 6.25 km

each cm represents 1 1/4 km

5 cm represents 5 times 1 1/4 km

= 6 1/4 km = 6.25 km