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
21 minutes
20.143 minutes
15 minutes

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Construction Planning and Management
If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then

None of these
expected time of both activities A and B are same
expected time of activity A is greater than the expected time of activity B
expected time of activity B is greater than the expected time of activity A

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

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

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