A tank initially contains 200 kg of salt in 1000 L of water. At exactly 10:00 am, pure water started to flow into the tank at a rate of 18 L/min. The well-mixed solution then leaves the tank at a rate of 20 L/min. When the amount the salt in the tank reaches 50% of the original, the incoming rate was increased by 4 L/min. At what time was the incoming rate increased? 10:11 am 10:22 am 10:33 am 10:44 am

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