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

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