In ancient times, the mathematical formula, explanatory formula and linear formula of "one foot breaks a hundred miles" on the ground were all expressed in metric system.
Because 1 ft = 1/3m and1mile = 500m, "one foot breaks a hundred miles" is (1/3) ÷ (100× 500) =/kloc.
So the answer is:1:150000; 1cm on the map is equal to the actual distance1500m (1.5km);