A is four times as fast as B. If B alone can do a piece of work in 60 days, in what time can A and B together complete the work?  Choose the most appropriate option:
A) 10  B) 12  C) 22  D) 28  E) 20
A can do the work in 60/4 i.e., 15 days.   A and B's one day's work = 1/15 + 1/60 = (4 + 1)/60 = 1/12   So A and B together can do the work in 12 days.   Answer: 12
<result>B</result>
A is four times as fast as B. If B alone can do a piece of work in 60 days, in what time can A and B together complete the work?