Please provide explanation

3. A web server system produces the following measurements. - Each web server request requires an average of 1.2 seconds of CPU time and generates an average of 40 disk accesses to Disk A and 20 disk accesses to Disk B. - On average, an access to either Disk A or Disk B requires 10msec. - Disk A throughput is measured at 30 disk accesses per second. - The average response time of Disk A is measured to be 25msec. (a) What is the utilization of the CPU? (b) What is the average number of accesses waiting for Disk A