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A tank initially contains 3 L of pure water. A solution containing 3 g/L of salt...

A tank initially contains 3 L of pure water. A solution containing 3 g/L of salt is pumped into the tank at a rate of 2 L/min, and the contents of the tank are also pumped out at a rate of 2 L/min. Let y(t) be the amount of salt in the tank at time t. For a short time interval from time t0 to time t0 + h, approximate the change y(t0 + h) − y(t0) in the amount of salt in the tank over the time interval. I don't even know where to begin. Steps and explanation would be amazing.

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