Converte unidades 5

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Como $1 \, mi= 160000 \, cm$ e $1 \, yd= 91.44 \, cm$, vem $$390 \, yd= 390 \times 91.44 \, cm = \frac{390 \times 91.44}{160000} \, mi=0.22 \, mi$$ e $$390 \, mi =390 \times 160000 \, cm =\frac{390 \times 160000}{91.44} \, yd = 682414.7 \, yd$$

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