given :
two cell towers are 8 centimeters apart.
given the scale of the map is 4 centimeter= kilometer.
As, distance = 8 cm
[tex]\begin{gathered} d=8\operatorname{cm} \\ =(4+4)\text{ cm} \\ \text{but 4 cm = 1 km} \\ \Rightarrow d=\text{ 2 km} \end{gathered}[/tex]Hence, the actual distance is 2 kilometer.