4. Two tanks A and B containing 360 liters of salt solution each, are interconnected by two pipes. Pure water pours into tank A at a rate of 5 L/min. The first pipe pumps salt solution from tank B into tank A at a rate of 4 L/min. The second pipe pumps solution from tank A into tank B at a rate of 9 L/min. Finally, there is a drain on tank B from which salt solution drains at a rate of 5 L/min. Thus each tank maintains a constant volume of 360 Liters of salt solution. Initially, there is 60 kg of salt present in tank A. But tank B contains pure water. Find the amount of salt in each tank after 10 minutes. Round your answer to two decimal places.

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