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Well, if 4cm is 12 km, and there are five 4cm in 20cm, 12*5=60, so:There are 60km in a distance of 20cm on a map with a scale of 4cm to 12km.
1 cm times 20cm
20cmx 20cm x20cm
It is 40,000mm
in inch 20cm = 7.8740 inches thank you!