A can do a certain job in 14 days. B is 60% more efficient than A. How many days does B alone take to do the same job?	Options:	A) 7 1/2 days	B) 8 3/4 days	C) 5 days	D) 9 days	E) None of them
Ratio of times taken by A and B = 160 : 100 = 8 : 5.   Suppose B alone takes x days to do the job.   Then, 8 : 5 :: 14 : x = 8x = 5 x 14 =x = 8 3/4 days.   Answer is 8 3/4 days.
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A can do a certain job in 14 days. B is 60% more efficient than A. How many days does B alone take to do the same job?