A and B can complete a work in 10 and 12 days respectively. A and B start working together and after 4 days, A left the work. Find in how many days work will be completed.
Answer & explanation
Correct answer: option 4
Total work = Efficiency × Number of days
Work done by ( A + B ) in 4 days = 11 × 4 = 44
Remaining work = 60 - 44 = 16
Time taken by B to complete the remaining work = \(\frac{16}{5}\)
= 3\(\frac{1}{5}\)
Total time taken in doing whole work = 4 + 3\(\frac{1}{5}\)
= 7\(\frac{1}{5}\) days