use mass balance

please solve the problem :)

3. The following three segments are a schematic representation of a particular body of water. The incoming flow is routed via a deep channel from segs 1 to 3 . The dispersion between two segments is small compared to the flow. However. both segs. 1 and 3 exchange dispersively with seg. 2 . The variable s is nonconservative and decays at 0.1/ day. (a) If it is estimated that the bulk dispersion between segs. 1 and 2 and between segs. 3 and 2 is equal to 107m/ day, set up the basic equations for solution of this problem in matrix form. (b) Suppose the concentration at the outflow has been measured at 0.26mg/l. Is original estimate of the dispersion of 107m/ day a good estimate