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6,4*(5/6)^2+1 5/9=6
2/3 * 6=4
8.12
2,4 godziny = 160min
160 min - 145km
60 min - x km
(60*145)/160=x
x=~54,375 km
8.13
20 3/8= 163/8
1 1/4 kg= 125/100
125/100 - 163/8
1 - x
x=(163/8)*(100/125)=16,3