Can someone please help me with this problem? Please show work.

Given the arrival of 3 processes P1,P2,P3, 4 clock intervals apart, starting at time 0, in that order, with the execution times of 7,9,6, respectively. Using the SJF scheduling algorithm generate a Gantt chart and use the chart to answer the following parts:

a.) list the order of execution of these processes (use the names of the processes)

b.) what is the exit time of each of those processes?

c.) what is the turnaround time for each of the processes?

d.) what is the wait time of each of the processes?