52 men can complete a highway strip between cities P and Q in 10 days. An emergency transfers 12 men to another project. How many more days than originally estimated are needed?
Total work is 52×10 = 520 man-days. Remaining workforce is 40, so completion takes 520/40 = 13 days at unchanged productivity. The extra duration is 13−10 = 3 days, A, not the total 13 days.
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