Two machines M1 and M2 are able to execute any of four jobs P, Q, R and S. The machine scan perform one job on one object at a time. Jobs P, Q, R and S take 30 minutes, 20 minutes, 60minutes and 15 minutes each respectively. There are 10 objects each requiring exactly 1 job. Job P is to be performed on 2 objects. Job Q on 3 objects. Job R on 1 object and Job S on 4 objects. What is the minimum time needed to complete all the jobs?