Question

The interfering float of activity R (in weeks, integer) is \(\underline{\hspace{2cm}}\). 

Hint:

Interfering float shows the delay that affects only the float of succeeding activities, not the entire project.

Answer 1

Correct Answer: 6

From the network diagram:

Activity \(R\):
- Duration = \(3\) weeks
- Early start (ES) = 12
- Early finish (EF) = 15
- Late start (LS) = 24
- Late finish (LF) = 27

Total float (TF): \[ TF = LS - ES = 24 - 12 = 12. \] Free float (FF):
Free float is the amount of delay allowed without delaying the earliest start of its successor.

Successor of \(R\) is \(S\), whose ES = 21.

Thus, \[ FF = ES_{S} - EF_{R} = 21 - 15 = 6. \] Interfering float (IF): \[ IF = TF - FF = 12 - 6 = 6. \] Final Answer: \[ 6 \]