An origin-destination pair is connected by a route with a performance function tl = 8 + x1, and another with a function t2 = 1 + 2x2 (with x's in thousands of vehicles per hour and t's in minutes).
If the total origin destination flow is 4000 veh/h, determine user equilibrium and system-optimal route travel times, total travel time (in vehicle-minutes), and route flows