- A12
- B25
- C10
- D15
Step-by-Step Solution
Combined rate = 1/20 + 1/30 = 3/60 + 2/60 = 5/60 = 1/12 of the order per day, so 12 days.
Answer: A) 12
Working alone, a tailor finishes an order in 20 days and his assistant in 30 days. How long will the order take if both work on it together? (answer in days)
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