A,B,C together can do a work in 30 days. A alone can do the work in 80 days and B alone can do the same work in 100 days. Find in what time C alone can do that work?  Choices:
A) 75days
B) 85.65days
C) 88.50days
D) 92.31days
E) 96days
The required answer is = 30*80*100 / 80*100-30(80+100)   = 240000/2600 = 92.31days   Answer is 92.31days
<result>D</result>
A,B,C together can do a work in 30 days. A alone can do the work in 80 days and B alone can do the same work in 100 days. Find in what time C alone can do that work?