A and B can complete a work in 8 days. B alone can do it in 12 days. In how many days will A alone complete the work?
Show answer & explanation
Correct answer: B
Explanation
Combined 1-day work efficiency of A and B = 1/8
B's 1-day work efficiency = 1/12
Therefore, A's 1-day work efficiency = 1/8 - 1/12
= (3 - 2)/24
= 1/24
So, A alone will complete the work in = 24 days