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

27 minutes
15 minutes
20.143 minutes
21 minutes

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Construction Planning and Management
Latest start of an activity is always

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

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