How long would five men working 4 hours a day take to dig a trench 45 m long?

Three men working for 8 hours a day take 6 days to dig a trench 9 m long. How long would five men working 4 hours a day take to dig a trench 45 m long?

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Men---Hours---Days---Length
3--------8-------6------9
5--------4-------x------45

$x=6 \times \frac{3}{5} \times \frac{8}{4} \times \frac{45}{9} = 36 \ days$

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raphael answered the question on January 6, 2017 at 14:20

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