Find the critical path and estimate the project duration

Question

    A project plan is given below:

     

Activity	Time duration in weeks	Predecessors
A	2	None
B	2	None
C	7	A
D	12	A
E	10	B
F	3	D,E
G	4	C,F

 

      (a) Construct a PERT network

     (b) Find the critical path and estimate the project duration