SOLUTION: Two pumps can fill a water tank in 60 minutes when working together. Alone, the second pump takes 9 times longer than the first to fill the tank. How long does it take the first pu

Question 1104400: Two pumps can fill a water tank in 60 minutes when working together. Alone, the second pump takes 9 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank?
Found 2 solutions by josgarithmetic, jorel1380:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
First pump, tank per minutes
Second pump, tanks per minutes
Both pumps together, tank per minutes

Solve this for x.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n be the time it takes for the first pump alone. Then, the second pipe would be 9n. So:
1/n+1/9n=1/60
180+20=3n
n=200/3 minutes for the first pump working alone
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