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1:30
1:3
3 x 15 = 45 km
1 cm - 300 000 cm
1 cm - 3000 m
1 cm - 3 km
1 cm ------------ 3 km
15 cm ------------- x (km)
Mnozymy na krzyz.
1*x = 15*3
x = 45 km
W rzeczywistosci odleglosc miedzy tymi miastami wynosi 45 km.