class 8
13. A tank has three inlets and one outlet. The inlets fill the tank in 20, 40 and 60 minutes, respectively. The outlet empties the tank in 50 minutes. If the tank is filled with all the inlets and outlet open, how long will it take to fill?
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three plus two 2020 plus two 40 40 plus 360 and 60 + 250 and other become
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13. A tank has three inlets and one outlet. The inlets fill the tank in 20, 40 and 60 minutes, respectively. The outlet empties the tank in 50 minutes. If the tank is filled with all the inlets and outlet open, how long will it take to fill?
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