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- Worker A takes 8 hours to do a job.
Question 1:
Worker A takes 8 hours to do a job. Worker B takes 10 hours to do a job. How long should it take both A and B, working together to do the same job? A. 4/9
B. 2 4/9
C. 3 4/9
D. 4 4/9
Feedback In this type of questions, first we need to calculate 1 hours work, then their collective work as A's 1-hour work is 1/8
B's 1-hour work is 1/10
(A+B)'s 1 hour work = 1/8 + 1/10= 9/40
So both will finish the work in 40/9 hours=4 4/9
B's 1-hour work is 1/10
(A+B)'s 1 hour work = 1/8 + 1/10= 9/40
So both will finish the work in 40/9 hours=4 4/9
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