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A worker can build a fence in 8 hours. with 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?

 Mar 5, 2020
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1/w  + 1/a = 1/5

1/8   + 1/a =1/ 5

1/a = 3/40

a = 40/3 hr = 13 1/3 hr

 Mar 5, 2020

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