SOLUTION: One drain can empty a storage tank in 8.5 hours. When this drain is used along with a second drain, the tank can be emptied in 5 hours. How long (to the nearest 0.1 hour) would it

Question 95083: One drain can empty a storage tank in 8.5 hours. When this drain is used along with a second drain, the tank can be emptied in 5 hours. How long (to the nearest 0.1 hour) would it take the second drain, working alone, to empty the tank?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
in 5 hours, the first drain empties 5/8.5 of the tank ... the second drain empties 1-5/8.5 of the tank

3.5/8.5 in 5 hours means it would take 5/(3.5/8.5) or 12.1 hours for the second drain alone
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