A 2 liter tank of water contains 3 grams of salt at time t = 0 (in minutes). Brine with concen-tration 3t grams of salt per liter at time t is added at a rate of one liter per minute. The tankis mixed well and is drained at 1 liter per minute. At what positive time is there a minimumamount of salt and what is that amount?
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