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gaby236
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If Jim Roller can paint a room in 3 hours while John Brush would take 5 hours, how long will they take if they work together?
 2 years ago
 2 years ago
gaby236 Group Title
If Jim Roller can paint a room in 3 hours while John Brush would take 5 hours, how long will they take if they work together?
 2 years ago
 2 years ago

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emilie.li Group TitleBest ResponseYou've already chosen the best response.0
i found this: http://answers.yahoo.com/question/index?qid=20070729140155AAUsPDt
 2 years ago

gaby236 Group TitleBest ResponseYou've already chosen the best response.0
a;1/8 hour b;8/15 hour c; 7/8 hours
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
What class is this?
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
I know, but what level of math?
 2 years ago

gaby236 Group TitleBest ResponseYou've already chosen the best response.0
i need help
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
You need to make a system of equations.
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
Let, \(t\) be the time it takes to paint the room. \(r\) is the rate that Roller to paints it, \(b\) is the rate that Brush paints it.
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
We know that \[ 3r = 5b \]
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
We also know that \[ (r+b)t = 3r = 5b \]
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
First solve for \(r\) in terms of \(b\) \[ 3r=5b\implies r = \frac{5}{3}b \]Now plug it into equation 2 \[ \left(\frac{5}{3}b+b\right)t=5b \]
 2 years ago

wio Group TitleBest ResponseYou've already chosen the best response.0
Then solve for \(t\).
 2 years ago

RadEn Group TitleBest ResponseYou've already chosen the best response.0
shorcut way : 3*5/(3+5) = 15/8 long way :p v1+v2 = x/3 + x/5 = 8x/15 = x/(15/8) so, if they work together will take 15/8 hours
 2 years ago

RadEn Group TitleBest ResponseYou've already chosen the best response.0
no correct options there
 2 years ago
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