Kavita can complete a piece of work alone in 12 hours, while Komal can complete the same work alone in 18 hours. Kavita works alone for the first 4 hours and leaves. After that, Komal comes and completes the remaining work by herself. How much time did Komal take to finish the remaining work?
Answer & explanation
Correct answer: option 4
Kavita = 12 hrs, Komal = 18 hrs,
⇒ Kavita worked for 4 hrs and left = 3 x 4 = 12 units, ..(Efficiency × Days = Total work)
⇒ Remaining work = 36 - 12 = 24 units,
⇒ Time required by Komal to complete the remaining work alone = \(\frac{24}{2}\) = 12 hrs, ..(\(\frac{Work}{Efficiency}\) = Time)