A can do a piece of work in 9 days while B can do it in

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A can do a piece of work in 9 days while B can do it in 12 days. A and B together can do the work in

A’s 1 day’s work =	1
	9

B’s 1 day’s work =	1
	12

∴ (A + B)’s 1 day’s work

=	1	+	1
	9		12

=	4 + 3	=	7
	36		36

∴ Required time

=	36	= 5	1	days
	7		7