# The scale of a road map indicates that 4 cm is equal to 30 km. How do you calculate the distance between two cities if the road between them is 10 cm long?

Jun 8, 2016

The distance between two cities is $75$ $k m s .$

#### Explanation:

As a road of $4$ $c m .$ on road map indicates a road of length equal to $30$ $k m .$

Each $c m .$ on map indicates $\frac{30}{4} = 7.5$ $k m s .$

Hence a distance of $10$ $c m .$ between two cities on the map indicates

$7.5 \times 10 = 75$ $k m s .$