Normal crash Normal crash Activity Slack Time Time 6055 Cost M 0 4 2 $310,000 $500,000 N 1 6 4 200,000 320,000 P 3 2 2 90,000 90,000 Q 3 2 1 180,000 250,000 2 7 6 80,000 120,000 S 0 H 2 225,000 450,000 T 0 3. 2 100,000 150,000 u 0 2 2 400,000 100,000