# 4 men, each working 6 hours per day can build a wall in 9 days. How long will 6 men, each working 3 hours per day take to finish the same work?

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4 men, each working 6 hours per day can build a wall in 9 days. How long will 6 men, each working 3 hours per day take to finish the same work?

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Clearly,  M propto 1/D and M propto 1/H
 rArr MDH = Constant.
 rArr M_(1)D_(1)H_(1)=M_(2)D_(2)H_(2)
 rArr 4 xx 9 xx 6 = 6 xx D_(2) xx 3
 rArr d_(2) = 12.
 :.  Six men each working 3 hourss per day can finish the job in 12 days.