A can complete a piece of work in 12 days, and B can complete the same work in 36 days. In how many days will both, together, complete the work?
Answer & explanation
Correct answer: option 4
A = 12 days, B = 36 days,
⇒ Time required by A + B to complete the total work = \(\frac{36}{3+1}\) = \(\frac{36}{4}\) = 9 days, ..(\(\frac{Work}{Efficiency}\) = Time)