Gantt Charts

On a Gantt chart, the solid block for task C starts at day $\displaystyle 4$ and ends at day $\displaystyle 9$.
A thin line continues from day $\displaystyle 9$ to day $\displaystyle 12$.
State the duration and the float time of task C.

State what a thin line to the right of a solid block represents on a Gantt chart.

The following tasks have these earliest start times and durations, in hours.
A: start $\displaystyle 0$, duration $\displaystyle 2$
B: start $\displaystyle 2$, duration $\displaystyle 3$
C: start $\displaystyle 2$, duration $\displaystyle 1$
D: start $\displaystyle 5$, duration $\displaystyle 2$
State which tasks are in progress $\displaystyle 3$ hours after the project begins.

On a Gantt chart, the solid blocks for tasks B, D and E all overlap on day $\displaystyle 4$.
Each task requires one worker.
State the smallest number of workers needed on day $\displaystyle 4$, and justify your answer.

State one advantage of using a Gantt chart rather than a PERT chart.

A task has a solid block from day $\displaystyle 6$ to day $\displaystyle 11$ and no thin line after it.
State what this tells you about the task.

On a Gantt chart, task F has a solid block from day $\displaystyle 3$ to day $\displaystyle 8$ and a thin line to day $\displaystyle 10$.
Task F is delayed and now finishes on day $\displaystyle 9$.
State the effect on the project, and justify your answer.

The Gantt chart below shows the activities required to complete a project.

Activity G is dependent on activities F and H.
Activity F is dependent on activities B, C and E.
Activity E is dependent on activity D.
Activities C and B are dependent on activity A.

(a) State the critical path for this project.

(b) State the duration of the float time for activity B.

(c) State one advantage of using a Gantt chart.