Processes $p1$ and $p2$ execute on a system with a single CPU and $2$ identical $\frac{1}{0}$ devices. The compute$-$bound phase of each process is $200$ time units, followed by an I$/$O$-$bound phase of $100$ time units.

The processes run concurrently using time$-$sharing. Assume that the switching overhead and the switching periods are negligible.

If both $\frac{1}{0}$ devices are used, then the total execution time for both processes is time units.

If only one I$/$O device is used, then the total execution time for both processes is time units