SOLUTION: a drain can empty a swimming pool in 16 days. A drain can empty this pool in 8 days. In how much time will the two drains working together empty the pool?

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Question 353752: a drain can empty a swimming pool in 16 days. A drain can empty this pool in 8 days. In how much time will the two drains working together empty the pool?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The equation is 1-x%281%2F16%2B1%2F8%29+=+0. Solving,
x%281%2F16%2B1%2F8%29+=+1,
%283x%29%2F16+=+1,
x+=+16%2F3days.