- A6 days
- B8 days
- C10 days
- D12 days
Step-by-Step Solution
A in 12 days does . B must do days, the whole period.
Answer: D) 12 days
A job must be done in 12 days. A alone takes 20 days. How many days must B (who takes 30 days alone) work alongside A to finish in time?
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