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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.

so nancy's rate is \(\frac{1}{20}\) of the job in one hour, would take nancy 20 hours working alone

the answer is not 2, and 4 is not the arithmetic average

So what's the answer?

20 hours working alone? it seems like they want minutes... or do I just convert it to minutes?

like multiplied 60?