Consider the following work breakdown structure: Given a due date of 210 days, what is the earliest you can start activity D without delaying the project?

		Time Estimates (days)
Activity	Precedes	Optimistic			Most Likely			Pessimistic
Start	A,B		-			-			-
A	C,D		44			50			56
B	D		45			60			75
C	E		42			45			48
D	F		31			40			49
E	F		27			36			39
F	End		58			70			82

		50
		60
		70
		100
		140