Consider the following trafc flow diagram: F x2 E If the flow in, at intersection A, is 535 cars and the flow out, at D, is 535 cars, consider the following question: the total time it takes vehicles to travel along any stretch of road is proportional to the trafc along that stretch. For example, the total time it takes the vehicles along AB is kX] minutes. Assuming that the constant is the same for all sections of road, the total time for all 535 vehicles to be in this network is kxl + 2kX2 + kX3 + 2kX4 + [065 minutes What is the total time if k = 6? at (3t + s, -t, 2t + s, t, s) where t and s go from 535 to 1070 minutes b. 541 minutes c. None ofthese choices d. (3t + s, -t, 2t + s, t, s) where t and s go from O to 535 minutes 9. 9630 minutes f. 3210 minutes