A and B together can do a piece of work in 12 days while

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A and B together can do a piece of work in 12 days while A alone can do the same work in 30 days. B alone can do it in

(A + B)’s 1 day’s work =	1
	12

A’s 1 day’s work =	1
	30

∴ B’s 1 day’s work =	1	-	1
	12		30

=	5 - 2	=	1
	60		20

∴ Required time = 20 days