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JANEK; 13 cm * 30000=390000 cm
390000 cm=3900 m=3,9 km
KAROL; 1cm=30000 cm=300 m=3,9 km
3,9 * 13 =3,9 km
13cm = 13cm * 30000cm = 390000cm = 3900m = 3,9km
Karol
1cm = 30000 * 1cm = 30000cm = 300m13cm = 13cm * 300m = 3900m = 3,9km