A tank initially contains a solution of 14 pounds of salt in 50 gallons of water. Water with 1/5 pound of salt per gallon is added to the tank at 6 gal/min, and the resulting solution leaves at the same rate. Let Q(t) denote the quantity (lbs) of salt at time t (min). (a) Write a differential equation for Q(t). Q' (t) = (b) Find the quantity Q(t) of salt in the tank at time t > 0. (c) Compute the limit. lim Q(t) = t48

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