Question

A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C & A can do it in 15 days. A, B and C together can complete it in.

• A. 6 days
• B. 9 days
• C. 10 days
• D. 10 1/2days

Answer 1

Answer:

C. 10 days

(2xyz) / (xy+ yz + xz) = (2 x 12 x 20 x 15) / (12 x 20 + 20 x 15 + 12 x 15) (2 x 12 x 20 x 15) / 720 = 10 days