12 men can complete a piece of work in 48 hours. In how many hours will 36 men complete the same piece of work ?
Using, $$M_1 D_1 = M_2 D_2$$
=> $$12 \times 48 = 36 \times D_2$$
=> $$D_2 = \frac{48}{3} = 16$$ hours
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