- A6
- B5
- C7
- D30
Step-by-Step Solution
Combined rate = 1/10 + 1/20 + 1/60 = 6/60 + 3/60 + 1/60 = 10/60 = 1/6, so 6 days.
Answer: A) 6
Three painters can each paint a school's compound wall alone in 10, 20 and 60 days. How many days will they take if all three work together?
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