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
27 minutes
15 minutes
20.143 minutes

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Construction Planning and Management
Pick up the correct statement from the following with regards to C.P.M. network analysis of projects

The latest occurrence time for the node at which the activity arrow terminates, is called latest finish time
The latest occurrence time of the node of which the activity arrow terminates minus the duration of the activity, is called latest start time
Earliest occurrence time of the event from which the activity arrow' originates, is called earliest start time of the activity
All listed here

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