Construction Planning and Management
A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be

21 minutes
15 minutes
20.143 minutes
27 minutes

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Construction Planning and Management
Earliest finish of an activity is always

Less than earliest event time of the following node
Greater than or equal to earliest event time of the following node
Greater than earliest event time of the following node
Less than or equal to earliest event time of the following node

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Construction Planning and Management
Free float is mainly used to

Identify the activities which can be delayed without affecting the total float of preceding activity
Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities
Identify the activities, which can be delayed without affecting the total float of succeeding activity
Establish priorities

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