要算式 求答！
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A/B = 100/90
B/C= 100/80
A/C = (100/90)÷(80/100) = 50/36 = 100/72
when A finished, C has finished 72m, at that time, A to C 28m
B/C= 100/80
A/C = (100/90)÷(80/100) = 50/36 = 100/72
when A finished, C has finished 72m, at that time, A to C 28m
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