A map has a scale of 1 cm : 3 km.
1 km = 1,00,000 cm.
Therefore .
The scale without units is 1 : 300000.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=aa57a3b1086c4c08a9ae8df8182e87f5.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")