Question 807915

scale {{{1:20000}}} means that any measurement on the map is multiplied {{{20000}}} times in the distance represented

Thus; {{{4cm}}} on the map will represent {{{4cm * 20000 = 80000cm}}} of distance on the ground 
since {{{1m =100cm}}}, you have {{{ 80000cm/100=800m}}} and since {{{1km=1000m}}}
you have {{{ 800m/1000=0.8km}}}

so, the actual distance is {{{0.8km}}}