A can do a piece of work in 6 days and B can do the same work in 12 days. How long will it take if A and B work together?
Q1. A can do a piece of work in 6 days and B can do the same work in 12 days. How long will it take if A and B work together?
Answer: 4
Explanation: Combined work rate = 1/6 + 1/12 = 1/4 per day, so together they finish the work in 4 days.