If A can complete a job in 12 days and B in 15 days, how many days will they take working together?
✓ Correct Answer: Option A
Combined rate = 1/12 + 1/15 = 9/60 = 3/20 per day. Time = 20/3 = 6⅔ days.
Combined rate = 1/12 + 1/15 = 9/60 = 3/20 per day. Time = 20/3 = 6⅔ days.