A tank contains 400 liters of freshwater, brine containing 0.3kg/liter of salt runs into the tank at the rate of 5 liters/minute. The mixture kept uniform by stirring, runs out at 10 liters/minute. Find the maximum amount of salt in the tank and the time required to reach the maximum. O 35 min; 30 kg O 30 min; 28 kg O 25 min; 26 kg O 40 min; 30 kg

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