<PRE><B>Question 761036</B>
5 men take 4 days to unload 5,000 tons of lumber. 
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1 man will take 5 times as long to unload the 5,000 tons, so
1 man takes 20 days to unload 5,000 tons of lumber.
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1 man will take twice as long to unload 10000 tons, so
1 man takes 40 days to unload 10,000 tons of lumber. 
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8 men will take 1/8 of that time to unload 10000 tons, so
8 men take 5 days to unload 10,000 tons of lumber. </PRE>