Rick can mop the floor in 5 minutes. Together Rick and Nancy can mop the floor in just 4 minutes. How long would it take Nancy to mop the floor alone?

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you get
\[\frac{1}{5}+r=\frac{1}{4}\]
\[r=\frac{1}{4}-\frac{1}{5}\]\[r=\frac{1}{20}\]

6 minutes for rick, rick+nancy = 4. Nancy can do it in 2. that way 6 and 2 average to 4.

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