Construction Planning and Management
Free float for any activity is defined as the difference between

its earliest finish time and earliest start time for its successor activity
its latest start time and earliest start time
its earliest finish time and latest start time for its successor activity
its latest finish time and earliest start time for its successor activity

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Construction Planning and Management
Latest start of an activity is always

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

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