If A complete a work in x days and B does the same work in y days. In how many days together A and B will complete that work?
Answer & explanation
Correct answer: option 3
Total work = Efficiency × Time
Total efficiency of both A & B = x + y
Total work = xy
Total time taken = \(\frac{xy}{x + y}\)
The correct answer is Option (3) → $\frac{x y}{x+y}$ days