5 workers construct a wall in 6 hours. How many hours are required to construct the same wall by 3 workers?
Answer: 10 hours
Explanation
Work done is constant.
If 6 workers take 5 hours, total work = 6 × 5 = 30 worker-hours.
For 3 workers, time = 30 ÷ 3 = 10 hours.
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