A can do a certain job in 12 days. B is 60% more efficient

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A can do a certain job in 12 days. B is 60% more efficient than A. To do the same job B alone would take :

Time taken by B

= 12 ×	100	=	15	= 7	1
	160		2		2

Aliter : Using Rule 17,
Here, x = 12, R = 60%
Time taken by B

= x ×	100	days
	100 + R

= 12 ×	100	days
	160

=	15	= 7	1	days
	2		2