2)
x=2y
(y+12)=x-6
y+12=2y-6
y=18
x=36
4x=3(x+20)
x=60
4*60=240 км
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2)
x=2y
(y+12)=x-6
y+12=2y-6
y=18
x=36
4x=3(x+20)
x=60
4*60=240 км