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anonymous
 3 years ago
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?
anonymous
 3 years ago
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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anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ricky's rate is \(\frac{1}{5}\) i.e. he can do one fifth of the job in 5 minutes you want nancy's rate, lets call it \(r\) then you know that \(4(\frac{1}{5}+r)=1\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0you get \[\frac{1}{5}+r=\frac{1}{4}\] \[r=\frac{1}{4}\frac{1}{5}\]\[r=\frac{1}{20}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.06 minutes for rick, rick+nancy = 4. Nancy can do it in 2. that way 6 and 2 average to 4.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so nancy's rate is \(\frac{1}{20}\) of the job in one hour, would take nancy 20 hours working alone

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Yeah basically I summed it up but satellite73 has the more detailed answer if yours needed to be in fraction form :)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0the answer is not 2, and 4 is not the arithmetic average

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0in fact that answer is clearly wrong, since if nancy can do it in two hours, how in the world will it take four hours for them to do it together??

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0So what's the answer?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.020 hours working alone? it seems like they want minutes... or do I just convert it to minutes?
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