A is thrice good a 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 one.
A) 20  B) 22 ½  C) 25  D) 30  E) 40
Explanation:   Ratio of times by A and 22 ½= 1:3   difference of time is 2 days 22 ½ takes 3 days if diff of time is 60 days 22 ½ takes 3/2 *60= 
<gadget id="calculator">3/2 *60</gadget>
<output>90</output>
90 days   A’s 1day work is=1/30   22 ½’s 1 day work =1/90   (A+22 ½ )’s one day work is=1/90 +1/30 =2/45   together can do work in 45/2 = 22 ½ days   Answer: Option 22 ½
<result>B</result>
A is thrice good a workman as B and therefore is able to finish a job in 60 days less than B. Working together they can do it in?