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Time & Work
Time, Distance and Speed

If 3 men can complete a work in 15 days, how many days will it take for 5 men to complete the same work?

Answer: A. 9 days
If 3 men complete the work in 15 days, the work done per man per day is 1/(3*15) = 1/45. Therefore, 5 men will complete the work in 9 days.
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