9. Tank A initially contains 200 liters of brine containing 225 N of salt. Eight liters of fresh water per minute enter A and the mixture, assumed uniform, passes from A to B, initially containing 200 liters of fresh water, at 8 liters/min. The resulting mixture, also kept uniform, leaves B at the rate of 8 liters/min. Find the amount of salt in tank B after one hour.

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