A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:	Choose the correct choice:  A) 20 days  B) 22 1/2 days  C) 25 days  D) 30 days  E) 40 days
Ratio of times taken by A and B = 1 : 3.   The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.   If difference of time is 2 days, B takes 3 days.   If difference of time is 60 days, B takes = 3/2 x 60 = 90 days.   So, A takes 30 days to do the work.   A’s 1 day’s work = 1/30   B’s 1 day’s work = 1/90   A’s and B’s one day work = 1/30 + 1/90 = 2/45.   Therefore, A and B together can do the work in = 45/2 = 22 1/2 days.   ANSWER:22 1/2 days
<result>B</result>
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in: