How to calculate and answer part c please explain how to find the length of a path

 

Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels. Time (weeks) Activity a m b Immediate Predecessor(s) Activity Time (weeks) a m b Immediate Predecessor(s) A 6 9 10 G - 2 3 5 C, E B 1 9 24 A H 1 1 1 F C 8 12 16 A I 7 7 7 F D 5 7 9 A J 6 8 12 D, G, H E 1 3 4 B K 1 1 4 LJ F 5 8 20 C, E a) The expected (estimated) time for activity C is 12 weeks. (Round your response to two decimal places.) b) The variance for activity C is 1.78 weeks. (Round your response to two decimal places.) c) Based on the calculation of the estimated times, the critical path is A-B-E-F-H-J-K A-D-J-K A-B-E-F-I-K A-B-E-G-J-K A-C-F-H-J-K A-C-F-I-K A-C-G-J-K