Question 761036
Five men take four days to unload 5000 tons of lumber. How long will it take 8 such men to unload 10,000 tons of lumber?
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5 men working 4 days=20 man-days to unload 5000 tons of lumber
to unload 10,000 tons of lumber will require 2*20=40 man-days

How long will it take 8 such men to unload 10,000 tons of lumber? 40/8= 5 days