Twenty Nine Versus One

Three CPU-bound jobs A, B and C all arrive at $t=0$ and each needs 10 ms. Context switches are free.

• FIFO runs A to completion, then B, then C.
• Round robin uses a 1 ms quantum and cycles A, B, C.

Turnaround is $T_{completion} - T_{arrival}$; response is $T_{firstrun} - T_{arrival}$.

What are round robin's average turnaround and FIFO's average response?