C and D together can make a chair in 4 days and C alone can make this chair in 12 days. In how many days D alone can make this chair?
Answer & explanation
Correct answer: option 2
C + D = 4 days,
C = 12 days,
⇒ C + D = 3, (Efficiency)
⇒ 1 + D = 3,
⇒ D = 2,
Time required by D to complete total work alone = \(\frac{12}{2}\) = 6 days, ..(\(\frac{Work}{Efficiency}\) = Time)