i need the answer quickly

Activity Predecessor Activity A B C D TO F A B B C D B Optimistic Time 1.5 3,5 2,5 1.5 9.5 3,5 Most Possible Time 2nd 4 3 2nd 10 4 Pessimistic Time 3,5 5.5 4.5 3,5 11,5 5.5 Activity Predecessor Activity A B C D TO F A B B C D B Optimistic Time 1.5 3,5 2,5 1.5 9.5 3,5 Most Possible Time 2nd 4 3 2nd 10 4 Pessimistic Time 3,5 5.5 4.5 3,5 11,5 5.5