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:  Answers:
A) 20 days
B) 22 1/2 days
C) 24 days
D) 25 days
E) 30 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 * 60)= 
<gadget id="calculator">(3/2 * 60)</gadget>
<output>90</output>
90 days   So, A takes 30 days to do the work.   A's 1 day's work=1/30   22 1/2 days's 1 day's work =1/90   (A + 22 1/2 days)'s 1 day's work = (1/30 + 1/90) = 4/90 = 2/45   A and 22 1/2 days 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: