Question 119503
{{{(1 cm) : (8 km)}}} 


About metric system: 

{{{1cm}}} is {{{(1/100)m}}}………or……..{{{1m=100cm}}}

{{{1m}}} is {{{(1/1000)km}}}………or……..{{{1km=1000m}}}

So, since {{{8km=8*1000m=8000m=8000*100cm=800000cm}}}

in your example map scale might be {{{1:800000}}}

and  {{{4 km=400000cm }}} and map scale might be {{{1:400000}}}



{{{ 1cm : 8 km =1cm : 800000cm}}} 

{{{ 1cm : 4 km =1cm : 400000cm}}}