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1 dzień:⅖x
x-⅖x=⅗x
2 dzień=⅓×⅗x=⅕x
⅕x+⅖x=⅗x
x-⅗x=⅖x=20km
x=20:⅖
x=50km
trasa liczy 50 km
(2/5)*x+(1/3)*(3/5)*x+20=x
3/5x+20=x
20=2/5x x=100/2=50