Answer:
32 km
Explanation:
The scale for a map determines the ratio between the distance on the map and the distance in real like.
![(On Map)/(Real World) =(4cm)/(8kilometers)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/b1nle6kt80zxvnab4m9lwywrpvntzzracy.png)
Because we know the closest beach is 12 cm away then we have
.
Notice that 4cm becomes 12 cm by multiplying by 3. Do the same for the denominator and we'll have the distance in kilometers.
![(4 * 3cm)/(8*4kilometers) =(12 cm)/(32 kilometers)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gx6tat14fixbsypdgydv04sjebw0j6jt39.png)