SOLUTION: A drain can empty a swimming pool in 8 days. A second drain can empty the same pool in 4 days. In how much time will the two drains working together empty the pool?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A drain can empty a swimming pool in 8 days. A second drain can empty the same pool in 4 days. In how much time will the two drains working together empty the pool?      Log On


   



Question 151817: A drain can empty a swimming pool in 8 days. A second drain can empty the same pool in 4 days. In how much time will the two drains working together empty the pool?
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
Remember:
D%5B1%5D = drain 1, 8 days
D%5B2%5D = drain 2, 4days
If work together,
=%28D%5B1%5D%2BD%5B2%5D%29%2F2
=%288%2B4%29%2F2
=12%2F2 = 6days ---------------> If 2 work together
Thank you,
Jojo