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

20.143 minutes
27 minutes
21 minutes
15 minutes

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Construction Planning and Management
Whenever an activity has zero total float, then

Free float of the activity must be zero but independent float need not be zero
Independent float must be zero but free float need not be zero
Free float and independent float both need not be zero
Free float and independent float both must be zero

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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

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

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