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
15 minutes
20.143 minutes
27 minutes

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Construction Planning and Management
Mobilization advance up to 10% of the cost of work is given to a contractor

For all activities required to start the work at site on finalization of the contract document
For the payment of advances to labour and other staff
On commencement of work at site for payment of loan taken by him
For the purchase of construction materials

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