Consider the network below with the following link travel time functions Xa is the flow (users) on link a; ta is the travel time of link a in minutes t₁(x1) = x₁ + 3 t₂(x2) = 2x2 + 1 t3(x3) = 3x3 t4(x4) = 22 t5(x5)= X5 1 2 X2 = C1D + c2 c1= c2= 5 3 3 4 Let D be the demand for the O-D pair (1, 4). (b) Assuming all paths are used at User-Equilibrium, express the link flow X2 as a function of D (Provide the values in 3 decimal places).

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