A 500-gal tank contains 200 gal fresh water. Salt water containing 0.5 lb/gal enters the tank at 4 gal/min. The well-stirred solution leaves the tank at the same rate.
a) How much salt is in the tank after 10 minutes?
b) Suppose after 10 minutes the salt water entering the tank is stopped and replaced by pure water entering at 4 gal/min. If the well-stirred mixture now leaves at 3 gal/min, how much salt is in the tank after another 10 minutes?
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