Q. A works twice as fast as B. If they work together, they finish in 18 days. How long will B take alone?
✅ Correct Answer: (D)
54 days
Explanation: Let B = x days → A = x/2. 1/x + 2/x = 1/18 → x = 54.
Explanation by: Ankit Singh
Let B = x days → A = x/2. 1/x + 2/x = 1/18 → x = 54.