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1cm-9 000 000cm
1cm-90 000m
1cm-90km
1600:90=17 7/9cm
1 cm - 9000000
1 cm - 90000 m
1 cm - 90 km
1cm - 90 km
xcm - 1600 km
x = 1600 km * 1 cm / 90 km = 17,78 cm