348. A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ? September 23, 2025 by Admin A. 80 days B. 100 days C. 120 days D. 150 days ✅ The correct answer is option C. 120 days.