this is a operations research question. please take your time to answer the question, no hurry! you could even take 24 hourse if you want to answer the question. show working out so I can better understand

Question 5 The diagram below contains the list of activities in a project with their time estimates (in weeks): C 25 F 10 D 15 15 G H 10 5 30 a. Calculate the earliest start and latest finish times for each node. b. Determine the critical path(s) and the expected project duration