A and B working together can do 45% of the work in 9 days. A alone can do the work in 30 days. How many days will B alone take to do the same work?
Answer & explanation
Correct answer: option 1
A + B = 45% of W = 9 days = 20 days,
A = 30 days,
⇒ A + B = 3, (Efficiency)
⇒ 2 + B = 3,
⇒ B = 1,
⇒ Time required by B to complete the work alone = \(\frac{60}{1}\) = 60 days, ..(\(\frac{Work}{Efficiency}\) = Time)