Jane Reed bakes breads and cakes in her home for parties and other affairs on a contract basis. Jane has only one oven for baking. One particular Monday morning she finds that she has agreed to complete five jobs for that day. Her husband John will make the deliveries, which requires about 15 minutes each. Suppose that she begins baking at 8:00 A.M.

Job Time Required Promised Time
1 1.2 hr. 11:30 A.M.
2 40 min 10:00 A.M.
3 2.2 hr. 11:00 A.M.
4 30 min. 1:00 P.M.
5 3.1 hr. 12:00 NOON
6 25 min 2:00 P.M.

Determine the sequence in which she should perform the jobs in order to minimize

a.) Mean flow time.

b.) Number of tardy jobs.

c. ) Maximum lateness.