SOLUTION: A tank can be filled in 9 hours by one pipe and in 12 hours by another. How long will it take both pipes to fill the empty tank?
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Question 826414: A tank can be filled in 9 hours by one pipe and in 12 hours by another. How long will it take both pipes to fill the empty tank?
Answer by josgarithmetic(39613) (Show Source): You can put this solution on YOUR website!
Handle rates as amount of tank per hour. The rate is the sum of the rates of the individual pipes.
That rate means, 7 tanks in 36 hours. Flip this and say, 36 hours to fill 7 tanks. Compute how many hours per tank.
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