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x+y= 12
x=3y
4y=12
y=3
x=9
Kasia ma 9 lat Asia 3 lata
B
1h10min=70min
70/2=35
35*0.5km= 17.5km
Rowerzsta przejedzie 17.5km
3x=y
x+3x=12
y=3x
x=3
y=9
B.