Q$.5$ please

A CFSTR that has a volume of $30,800,000$ gallons receives a wastewater flow of $110$ gallons per day $(1$ MGD$)$ that contains $200m\frac{g}{1}$ of a contaminant. Assume that the contaminant degradation follows first$-$order kinetics and has a reaction rate constant of $0\mathrm{.}4$ day ${?}^{-1}.$ Determine the effluent concentration when the system reaches steady state.

Assume that the contaminant in the CFSTR described in problem no$.3$ does not degrade. If the CFSTR was initially filled with clean water and the wastewater was introduced at $t=0,$ what would be the contaminant concentration within the CFSTR $10$ days after the first introduction of the wastewater?

Assume that the contaminant in the CFSTR described in problem no$.3$ does not degrade. If the CFSTR was initially filled with clean water and wastewater was introduced at $t=0,$ how many days of flow would be required before the effluent concentration was equal to $95\%$ of the influent concentration?