Worker A takes 8 hours to do a job. Worker B takes 10 hour to do the same job. How long should it take both A and B, working together but independently, to do the same job?
Solution
Correct Answer: Option A
working together, they can do 1/10+1/8=9/40
they can do the whole job in: 40/9 days=4(4/9) days
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