A tank initially contains 10 kg of salt in 50 liters of water. Pure water enters at a rate of 2 U/min and excess of the solution is drained out at the same rate. If the solution is mixed thoroughly at any time, how many kilograms of salt will remain in the tank after 15 minutes? a. 5.488 kg b. 4.588 kg c. 8.458 kg d. 8.548 kg

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