SOLUTION: Working alone, it takes Stephanie seven hours to clean an attic. Shayna can clean the same attic in 12 hours. Find how long it would take them if they worked together?

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Question 1165618: Working alone, it takes Stephanie seven hours to clean an attic. Shayna can clean the same attic in 12 hours. Find how long it would take them if they worked together?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The two RATES are 1%2F7 and 1%2F12 units ATTIC per HOURS.


The combined rate of both together, 1%2F7%2B1%2F12;
%2812%2B7%29%2F%287%2A12%29

and for the TIME to do the job, %287%2A12%29%2F%2812%2B7%29-----------do what you need.