One inlet pipe fills an empty tank in 5 hours. A second inlet pipe fills the same tank in 3 hours. If both pipes are used together, how long will it take to fill $$\frac{2}{3}$$of the tank?
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A$$\frac{8}{15}hr$$
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B$$\frac{3}{4}hr$$
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C$$\frac{5}{4}hr$$
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D$$\frac{15}{8}hr$$
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E$$\frac{8}{3}hr$$