39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, of same efficiency working 6 hours a day, complete the work?
Answer: 13
Explanation
Let's calculate the total man-hours required to complete the work:
39 persons * 5 hours/day * 12 days = 2340 man-hours
If 30 persons work 6 hours a day:
Let x be the number of days they need to complete the work:
30 persons * 6 hours/day * x days = 2340 man-hours
180x = 2340
x = 13
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