A is three times as fast as B. If B alone can do a piece of work in 12 days, in what time can A and B together complete the work?  Choose the correct choice from the following answers:
A) 5	B) 8	C) 3	D) 2	E) 12
A can do the work in 12/3 i.e., 4 days.   A and B's one day's work = 1/4 + 1/12 = (3+ 1)/12 = 1/3   So A and B together can do the work in 3 days.   Answer:3
<result>C</result>
A is three times as fast as B. If B alone can do a piece of work in 12 days, in what time can A and B together complete the work?