Question
6. In a tank there are 1000 gal of water with a concentration of 1 lb per gallon of
pollutant. Water with a concentration of 0.2 lb per gal flows in at a rate of 4 gal per
minute. At the same time, water flows out at the same rate through a hose at the
bottom. When will the concentration of pollutant decrease under 0.5 lb per gal?
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6. In a tank there are 1000 gal of water with a concentration of 1 lb per gallon of pollutant. Water with a concentration of 0.2 lb per gal flows in at a rate of 4 gal per minute. At the same time, water flows out at the same rate through a hose at the bottom. When will the concentration of pollutant decrease under 0.5 lb per gal?

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