Construction Planning and Management
Optimistic time, most likely time and pessimistic times for the activities of a network in the given figure are written above their arrows. If the contractual obligation time for the project is 75, the latest occurrence time for the event 2, is

25
35
15
20

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

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

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Construction Planning and Management
In time-cost optimization of a project, crashing is done.

On original critical activities and those that become critical at any stage of crashing in the order of ascending cost slope
Only on activities lying on the original critical path and having flatter cost slopes
On all the activities lying on the critical path
On all the activities

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