A cylindrical tank initially contains 400 liters of fluid with 90 grams of salt dissolved in it. Brine containing 8 grams of salt per liter runs in at a rate of 5 liters per minute through pipe A, while another brine containing 6 grams of salt per liter runs in at a rate of 3 liters per minute through pipe B. The well-mixed solution then runs out from the tank at a rate of 4 liters per minute as shown in Figure Q5(a). Let y(t) be the amount of salt in the cylindrical tank at any time t. Рipe A 5 liters/min Рipe B

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