A and B can separately do a piece of work in 6 days and 12 days respectively. How long will they together take to do the work?

A and B can separately do a piece of work in 6 days and 12 days respectively. How long will they together take to do the work?
[A]4 days
[B]6 days
[C]9 days
[D]18 days

4 days
(A + B)’s 1 day’s work $latex = \frac{1}{6}+\frac{1}{12} = \frac{2+1}{12} = \frac{1}{4}&s=1$
∴ A and B together will complete the work in 4 days.
Hence option [A] is correct answer.


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