Question

A scale model of a city has scale of 1 cm : 4.5 km. Two buildings in the model are 1.9 cm apart. To the nearest tenth of a kilometer, what is the actual distance between the buildings in the city?

Answer 1

`\bf \stackrel{cm}{1}~:~\stackrel{km}{4.5}\qquad \cfrac{1}{4.5}\qquad \qquad \cfrac{\stackrel{model}{1.9}}{\stackrel{actual}{x}}=\cfrac{1}{4.5}\implies \cfrac{1.9\cdot 4.5}{1}=x`