SOLUTION: Four men can dig a 40 foot well in 4 days. How long would it take for 8 men to dig a 60 foot well?

Question 199674: Four men can dig a 40 foot well in 4 days. How long would it take for 8 men to dig a 60 foot well?
Found 2 solutions by Alan3354, ankor@dixie-net.com:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Four men can dig a 40 foot well in 4 days. How long would it take for 8 men to dig a 60 foot well?
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A 60 ft well would take the original 4 men 1.5 times as long, or 6 days.
Having 2x as many men cuts that in 1/2, so it's:
3 days.
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(4 days * 1.5)/2 = 3 days
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This all assumes that there is room for 8 men to work at the bottom of the hole without getting in each other's way, which is not likely.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Four men can dig a 40 foot well in 4 days.
How long would it take for 8 men to dig a 60 foot well?
:
Find how many man-days required to dig a 40 ft well:
4 * 4 = 16 man-days
:
Let x = no. of days to dig the 60 ft well
:
Use a ratio equation:
=
Simplify
=
Cross multiply
40x = 2*60
40x =
x = 3 days, 8 men dig a 60 ft well
:
:
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