[1\frac{1}{6}h=70min\\ \frac{7}{8}\ of\ wall\ in\ 70\ min\ x\ wall\ in\ 1\ min\\ Proportion:\ \frac{7}{8}-70\ x-1\\Cross \ multiplication\\ \frac{7}{8}=70x\ \ \ | divide\ by\ 70\\ x=\frac{1}{80}\\ In\ 1\ min\ Melinda\ will\ paint\ \frac{1}{80}\ of \ wall.
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Melinda paints 80 1 of the wall in one minute. She takes 70 minutes to paint 8 7 of the wall. Using proportions, we find that she paints this fraction in one minute.
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