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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?
 one year ago
 one year 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?
 one year ago
 one year ago

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satellite73Best ResponseYou've already chosen the best response.1
ricky'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 \(4(\frac{1}{5}+r)=1\)
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
you get \[\frac{1}{5}+r=\frac{1}{4}\] \[r=\frac{1}{4}\frac{1}{5}\]\[r=\frac{1}{20}\]
 one year ago

gianarptBest ResponseYou've already chosen the best response.0
6 minutes for rick, rick+nancy = 4. Nancy can do it in 2. that way 6 and 2 average to 4.
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
so nancy's rate is \(\frac{1}{20}\) of the job in one hour, would take nancy 20 hours working alone
 one year ago

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

satellite73Best ResponseYou've already chosen the best response.1
the answer is not 2, and 4 is not the arithmetic average
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
in 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??
 one year ago

dumbsearch2Best ResponseYou've already chosen the best response.0
So what's the answer?
 one year ago

dumbsearch2Best ResponseYou've already chosen the best response.0
20 hours working alone? it seems like they want minutes... or do I just convert it to minutes?
 one year ago

dumbsearch2Best ResponseYou've already chosen the best response.0
like multiplied 60?
 one year ago
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