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A worker can build a fence in 8 hours, With the help of an assistant, the fence can be built in 5 hours. How long should it take the assistant, working alone, to build the fence?

Mathematics
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Wouldn't it be the same amount of hours?
What was wrong with my previous answer?
9 hours.

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Other answers:

Not necessarily. And could you please show some work?
well lets say the assistant worked at the same rate as the worker. then it would take half the time, 4 hours right.
Oh. Nevermind. The answer is 40/3 hours.
oh :(
13 hours? how?
Worker=W Assistant=A 1/A+1/W=1/5 1/A+1/8=1/5 8+A/8A=1/5 5*(8+A)=8A 40+5A=8A 3A=40 A=40/3 hours
are you sure?
why 1/A ?
It's the work rate.
Algebra.
why is the rate 1/A ?
sorry, i dont get it
So it takes you 6 minutes to shower, right?
You've showered for 2 minutes already. Doesn't that mean that you showered for 2/6 of the regular shower time or 1/3?
http://www.purplemath.com/modules/workprob.htm
That makes sense.

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