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?
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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.