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

Given the arrival of 3 processes P1,P2,P3, in this order, 5 clock intervals apart, P2 arrives at 5 and so on, starting at time 0, in that order, with the execution times of 15,6,3 respectively. Using the Round Robin (RR) scheduling algorithm with a quantum of 4, 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 wait time of each of those processes?

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

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