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100%-70%=30%
30%=18km
31%=18/30+18=18,6km
39%=18/30*9+18=23,4km
100%=18+23,4+18,6=60km
ODP: cała trasa liczyla 60km
39%x=0.39x I dzień
31%x=0.31x II dzień
x=0.39x+0.31x+18
x-0.7x=18
0.3x=18
x=60[km]
39%x=0.39x I dzień
31%x=0.31x II dzień
x=0.39x+0.31x+18
x-0.7x=18
0.3x=18
x=60[km]