4 workers take 9 hours to dig a well, working at the same rate, if they work together for 4 hours. How many hours take 6 workers to dig the same well?
- 6
- 7
- 8
- None of these
Explanation
4 workers take 9 hours
=> Total work = 4 × 9 = 36 worker-hours
6 workers => time = Total work / workers
= 36 / 6
= 6 hours
Last verified on 10-02-2026
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