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.
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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Find how many man-days required to dig a 40 ft well:
4 * 4 = 16 man-days
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Let x = no. of days to dig the 60 ft well
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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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