【Daily Topic】【Engineering Version 20160928】
Thread Content
Participation reward: 2 Wealth. Reward for the correct answer: 9 wealth. In a certain project’s double-code network plan, task N has an earliest start time of day 20 and a latest start time of day 25; its duration is 9 days. This task has two immediate successors, whose earliest start times are day 32 and day 34 respectively; therefore, the total float and free float of task N are ( ) days respectively. A. 3 and 0 B. 3 and 2 C. 5 and 0 D. 5 and 3 The correct answer is D. The total float for a task is equal to the difference between its latest possible completion time and its earliest possible completion time, or between its latest possible start time and its earliest possible start time; in this case, the total float = 25 – 20 = 5 days. For a task with subsequent tasks, its free float is equal to the minimum value of the difference between the earliest start time of the subsequent tasks and the earliest completion time of this task, that is, 32–20–9=3 days.
In a double-code network plan for a certain project, task N has an earliest start time of day 20 and a latest start time of day 25, with a duration of 9 days. This task has two successor tasks, whose earliest start times are day 32 and day 34 respectively; therefore, the total float and free float of task N are (D) days respectively. A. 3 and 0 B. 3 and 2 C. 5 and 0 D. 5 and 3