this is another problem and explain why is that the answer

B9 46 CHAPTER 9 . TRANSPORTATION, ASSIGNMENT, AND NETWORK MODE : 9-23 Four automobiles have entered Bubba's Repair Shop for various types of work, ranging from a transmis- sion overhaul to a brake job. The experience level of PROFESSO the mechanics is quite varied, and Bubba would like to minimize the time required to complete all of the Anderson jobs. He has estimated the time in minutes for each Sweeney mechanic to complete each job. Billy can complete Williams job 1 in 400 minutes, job 2 in 90 minutes, job 3 in Mckinney 60 minutes, and job 4 in 120 minutes. Taylor will finish job 1 in 650 minutes, job 2 in 120 minutes, job 2: 9-27 T 3 in 90 minutes, and job 4 in 180 minutes. Mark will a finish job 1 in 480 minutes, job 2 in 120 minutes, job n 3 in 80 minutes, and job 4 in 180 minutes. John will complete job 1 in 500 minutes, job 2 in 110 minutes, job 3 in 90 minutes, and job 4 in 150 minutes. Each B mechanic should be assigned to just one of these jobs. le What is the minimum total time required to finish the n four jobs? Who should be assigned to each job? a