Question

A road map has a scale of 1 : 30 000

The length of a road on the map is 7 cm.
Work out the length, in kilometres, of the real road. *
(3 Points)
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Answer 1

Answer: 2.1 km

Explanation:

Given

A road map has a scale of
`1:30,000`

The length of road on the map is
`7\ cm`

The ratio of length on the map to the length on road is 1:30,000

Suppose x is the length of real road

`\Rightarrow (7)/(x)=(1)/(30,000)\\\Rightarrow x=30,000* 7\ cm\approx 2.1\ km`