A and B can do a job together in 6 days. A alone can do it in 9 days. How long will B take to do the job alone?
Q1. A and B can do a job together in 6 days. A alone can do it in 9 days. How long will B take to do the job alone?
Answer: 18 days
Explanation: Rate of A and B together = 1 / 6, Rate of A = 1 / 9. Rate of B = 1 / 6 - 1 / 9 = 1 / 18. So, B alone will take 18 days.