44.Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but indepently, to do the same job?
A. 2x4/9 B. 4x4/9
C. 5x4/9 D. 4x2/9
Answer:
A's 1 day's work = 1/8
B's 1 day's work = 1/10
(A+B)'s 1 day's work = (1/8 + 1/10)
= 9/40.
Both A and B will finish the work in = 40 / 9
‹=›4x4/9
