An engineering project is modelled by the following activity sheet.

Activity	Predecessor	Duration (Days)	ES	EF	LS	LF
A	-	10
B	-	14
C	A	11
D	B	5
E	B	15
F	B	20
G	C, D	8
H	C, D	12
I	G	16
J	E, H	10
K	E, H	21
L	E, H	6
M	I, J	9
N	F, L	12

a- Calculate the early time and late time for each event can start. (i.e. calculate ES, EF, LS, and LF for all events).

b- State the critical path for the project.

c- What is the shortest possible time needed to complete this project?

d- Find the total and free float (or slack) on activities D and F.

An engineering project is modelled by the following activity sheet. + Activity Predecessor ES EF LS LF Duration (Days) 10 14 11 A B C D E F G H I J K A B B B C D C D G E, H E, H E, H I,J F, L 5 15 20 8 12 16 10 21 6 9 12 M N a- Calculate the early time and late time for each event can start. (i.e. calculate ES, EF, LS, and LF for all events). b-State the critical path for the project. C- What is the shortest possible time needed to complete this project? d- Find the total and free float (or slack) on activities D and F