A and B can do a piece of work alone in 15 and 30 days respectively. In how many days can they together complete the work?
Answer & explanation
Correct answer: option 1
A = 15 days, B = 30 days,
⇒ A + B can complete the work in = \(\frac{30}{2+1}\) = \(\frac{30}{3}\) = 10 days, ..(\(\frac{Work}{Efficiency}\) = Time)