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
20.143 minutes
27 minutes
15 minutes

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Construction Planning and Management
During the construction period, price variation clause in contracts caters to

Rate of inflation
Variation in total cost of the project on an ad hoc basis
Increase in rates of only important materials
Variation in cost in materials element, labour element and petrol-oil-lubricant element

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Construction Planning and Management
Crash project duration is obtained by summing the

Crash durations for all the activities along the critical path obtained by taking into account the crash duration for all the activities
Crash durations for all the activities along the critical path obtained by taking into account the normal duration for all the activities
Normal durations for all the activities
Crash durations for all activities

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