Given the following network with activity times in weeks, determine the earliest start and finish times, latest start and finish times, and slack for each activity. Indicate the critical path and the project duration. A flow diagram shows activity in weeks. The flow diagram is as follows, start branches into two nodes, node 1 and node 2. Node 1 with activity number - 1 and activity time - 10 leads to nodes 3 and 4. Node 2 with activity number 7 leads to nodes 5 and 6. Nodes 4 and 5 with activity numbers 4 and 6 leads to node 7 with activity number 7 respectively. Node 3 with activity number 15, node 6 with activity number 12, and node 7 leads to node 8 with activity number 9.