Construction Planning and Management
Whenever an activity has zero total float, then

Free float and independent float both must be zero
Free float of the activity must be zero but independent float need not be zero
Independent float must be zero but free float need not be zero
Free float and independent float both need not be zero

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Construction Planning and Management
Latest start of an activity is always

equal to latest event time of preceding node
less than or equal to latest event time of preceding node
greater than or equal to latest event time of preceding node
less than latest event time of preceding node

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