SOLUTION: Ana can finish a certain job in 10 hours. Together, Ana and Nina can finish the same job in 3 hours. How many hours can Nina finish the job alone?

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Question 1062657: Ana can finish a certain job in 10 hours. Together, Ana and Nina can finish the same job in 3 hours. How many hours can Nina finish the job alone?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be how many hours Nina alone can do the job.
1%2F10%2B1%2Fx=1%2F3