1km = 100000cm
30km x 100000cm/km = 3000000cm
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8 cm in km would be 0.00008km
30
To find out how many kilometers 0.5 cm represents on the map, you can set up a proportion. Since 2 cm represents 50 km, you can write the proportion as 2 cm is to 50 km as 0.5 cm is to x km. Cross multiplying, you get 2 * x = 0.5 * 50. Solving for x, you find that 0.5 cm on the map represents 12.5 kilometers.
First find how many km per cm by dividing 45 by 3 = 15. Next multipy 15 X 10 = 150. 10 cm = 150 km
.00003 km. 100cm = 1m 1000m = 1km 100x1000 = 100,000cm per km 3cm / 100,000 = .00003km