Machine A can complete a task in 6 hours. Machine B can complete the same task in 8 hours. If both machines work together for 2 hours, what fraction of the task will they complete?

✓ Correct Answer: Option B

Machine A's rate is 1/6 task/hr, and Machine B's rate is 1/8 task/hr. Their combined rate is 1/6 + 1/8 = 4/24 + 3/24 = 7/24 task/hr. In 2 hours, they will complete (7/24) * 2 = 7/12 of the task.