<PRE><B>Question 561809</B>
OK 
If 4 men take 8 hours to build a wall, then the wall require 4*8=32 man hours to build.  In other words: 
32 men could build the wall in 1 hour
16 men could build the wall in 2 hours
8 men could build the wall in 4 hours
etc

Now 7 men would take 32/7=4.57 hr to build the wall


Another way:
Let x=time it takes 7 men to build the wall
1 man works at the rate of 1/32 of the wall per hour
7 men works at the rate of 7/32 of the wall per hour
soooo
7/32*x=1 (1 wall that is)
x=32/7=same as above

Hope this helps---ptaylor


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