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. Then B can do the same piece of work in

1. 8 days
2. 7 1 days
  2
3. 6 1 days
  4
4. 6 days

Correct Option: B

A can do a work in 12 days.
B is 60% more efficient than A.
∴ Time taken by B

=		100	× 12		days
		160

=	15	= 7	1
	2		2