Statement of scale is simplest of the three methods.

$1:50,000$ (into metres)

$5 \mathrm{cm}$ represents $10 \mathrm{km}$

$1 \mathrm{cm}$ represents $100$ metres

$1:126,720$ (into miles)

$1:100,000$ (into km)

$1$ inch represents $1$ yard

$2$ inches represents $4$ miles

$1:31680$ (into furlongs)