A 100,000 liter tank of pure water was accidentally mixed with a 7000 liters of salt with a concentration of 90k kilos.  To solve this problem, they continuously pour fresh water into the tank at a rate of 50 liters per minute and release the salt solution at the same rate. Find: The differential equation on this problem. The amount of salt after 3 days. Number of minutes at half of the original salt content.

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