A can complete a work in 12 days and B can complete it in 8 days. How long will they take together?
Show answer & explanation
Correct answer: A
Explanation
A's 1-day work efficiency = 1/12
B's 1-day work efficiency = 1/8
Combined 1-day work efficiency of both = 1/12 + 1/8
= (2 + 3)/24
= 5/24
Therefore, time taken to complete the work = 24/5 days
= 4.8 days