Question:-
In a network, what is total float equal to ?
Option (A)
LFTj – ESTi + ti-j
Option (B)
ESTj – LFTi – ti-j
Option(C)
ESTj – LFTi – ti-j
Option(D)
LFTj – ESTi – ti-j
where, LFT = latest finish time of an activity; EST = earliest start time of an activity; ti-j, = time of activity i–j.
Correct Option:
(D)
Question Solution:

Dij = Time of activity

Total Float (T.F) = (Lj-Ei)–Dij
Free Float (F.F) = (Ej-Ei)–Dij
Independent Float (I.F) = (Ej-Li)–Dij
Safety Float (S.F) = (Lj-Ei)-Dij
Tail Slack (T.S.) = Li-Ei
Head Slack (H.S) = Lj-Ei
question-answer-faq-8868