Suppose two jobs, each of which needs 10 minutes of CPU time, start simultaneously. Assume 50% I/O wait time. How long will it take for both to complete, if they run sequentially?
- A. 10
- B. 20
- C. 30
- D. 40
Answer: D. 40
Explanation: Sequential execution: Job 1 takes 10min CPU + 10min I/O = 20 mins. Job 2 takes 20 mins. Total 40.