Question

what number can you multiply each distance in the scale drawing by to find the actual distance? 3 cm : 1.5 km

Explanation:

Step1: Determine the scale factor

The scale is given as $3\ cm:1.5\ km$. First, convert $1.5\ km$ to $cm$. Since $1\ km = 100000\ cm$, then $1.5\ km=1.5\times100000 = 150000\ cm$.
The scale factor is $\frac{150000}{3}=50000$.

Answer:

50000