A can do a piece of work in 10 days and B can do it in 15 days. They do the work alternatively. If B begins the work, then in how many days will the work finish?
Answer & explanation
Correct answer: option 1
Let the total work be 30
1st day work (B) = 2
2nd day work (A) = 3
Work done in every 2 days = 2 + 3 = 5
Therefore,
30 work will be completed in = 2 × 6 = 12 days