Q. A and B together can do a piece of work in 8 days. B works alone for 4 days and then A joins him. The work finishes in 2 more days. How long does A alone take?
✅ Correct Answer: (B)
12 days
Explanation: A+B = 1/8 → work/day. Work done by B for 4 days = 4B. Total 6 days work = 1 → 4B + 2(A+B) = 1 → solve → A = 1/12.
Explanation by: Kartik Sharma
A+B = 1/8 → work/day. Work done by B for 4 days = 4B. Total 6 days work = 1 → 4B + 2(A+B) = 1 → solve → A = 1/12.