SOLUTION: A worker can build a fence in 16 hours. With the help of an assistant, the fence can be built in 9 hours. How long should it take the assistant, working alone, to build the fence?

Question 129954: A worker can build a fence in 16 hours. With the help of an assistant, the fence can be built in 9 hours. How long should it take the assistant, working alone, to build the fence?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = assistant's time to build fence
In words:
(1 fence)/(worker's time) + (1 fence)/ (assitant's time) =
(1 fence) / (time for both working together)

multiply both sides by

It takes the assistant 20 hrs and 34 minutes approximately
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