A and B complete a job in 6 days. A alone can do the job in 15 days. If B works alone, how many days will it take to complete the job?	Pick one.
A) 8	B) 10	C) 12	D) 14	E) 16
The rate of A and B is 1/6   A's rate is 1/15   B's rate is 1/6 - 1/15 = 1/10   B can complete the job in 10 days.   The answer is 10.
<result>B</result>
A and B complete a job in 6 days. A alone can do the job in 15 days. If B works alone, how many days will it take to complete the job?