Asked by Ruth
                Susan's backyard has three faucets: A, B and C. If she turns on all three of them, it takes 380 minutes to fill the pool. If she turns on only A and B, it takes 570 minutes, and if she turns on only B and C, it takes 760 minutes. If she turns on only A and C, how long will it take (in minutes) to fill the pool?
            
            
        Answers
                    Answered by
            Steve
            
    1/a + 1/b + 1/c = 1/380
1/a + 1/b = 1/570
1/b + 1/c = 1/760
solve for a,b,c and you get
1/a + 1/c = 1/760 + 1/1140 = 1/456
    
1/a + 1/b = 1/570
1/b + 1/c = 1/760
solve for a,b,c and you get
1/a + 1/c = 1/760 + 1/1140 = 1/456
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