We start with 1000 liters of seawater in a tank. In seawater there are 35 g of salt per liter. Suppose we continually pour almost fresh water (2 g salt/liter) into the top of the tank at the rate of 4 liters/minute and at the bottom of the tank, we continually drain o ff 4 liters/minute. So the amount of water in the tank is always 1000 liters. Assume that the water in the tank is being stirred so that the saltwater and the freshwater mix immediately. How long until the concentration of salt in the tank is 4 g/liter?  Give your answer to the nearest hundredth of a minute (2 decimal places)

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.