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Answer :
Given: Scale of 1 cm represents 18 km.So, let x cm be the distance covered in the map for the drives of 72 km on a road.
We can see that this is the case of direct proportion,So we have
\(\frac{1}{x}=\frac{18}{72}\)
\(\Rightarrow 18x= 1\times72\)
\(\Rightarrow x= \frac{ 1 \times72}{18}\)
\(\Rightarrow x=4cm\)
Hence, for 72km of distance we have 4 cm of scale.