Six clerks can complete a piece of work in 15 hours. After working for 5 hours, 3 more clerks join them with the same efficiency. How much total time will be required to complete the work?
- 11 hours 40 minutes
- 11 hours 50 minutes
- 11 hours 20 minutes
- None of these
Explanation
Total work = 6 clerks _ 15 hours = 90 clerk-hours
Work done in first 5 hours = 6 _ 5 = 30 clerk-hours
Remaining work = 90 - 30 = 60 clerk-hours
Now total clerks = 6 + 3 = 9 clerks
Time to finish remaining work = 60 / 9 = 6.66 hours = 6 hours 40 minutes
Total time required = 5 hours + 6 hours 40 minutes = 11 hours 40 minutes
Last verified on 24-10-2026
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