Question

Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?

Answer 1

Let the distance represented on the map be x cm. 
The given information in the form of a table is as follows

Distance covered on road in (in km)	18	72
Distance represented on map (in cm)	1	x

The distances covered on road and represented on map are directly proportional to each other. 
Therefore, we obtain
\(\frac{18}{1}=72x\)
\(⇒ x=\frac{72}{18}=4\)
Hence, the distance covered in the map is 4 cm.