if A and B both work for 6 hrs,B and C work for 7.5 hrs,C and A work for 10 hrs .
i dont remember but ......its arrange in increasing order by their work Choose one:
A) cab
B) cba
C) abc
D) bac
E) none of these
A and B both can finish the work in 6 days means   1/A+1/B=1/6 ................(i)   B and C both can finish the work in 7.5 days means   1/B+1/C=1/7.5 ...................(ii)   C and A both can finish the work in 10 days means   1/A+1/B=1/10 ........................(iii)   Adding (i),(ii) and (iii), we get   2(1/A+1/B+1/C)=2/5 ......................(iv)   from (i) we have 1/A+1/B=1/6 put in (iv) ,we wiil get   1/6+1/C=1/5   C=30   Similarly, we will get A=15 and B=10   so in increasing order it will be BAC   ANSWER:bac
<result>D</result>
if A and B both work for 6 hrs,B and C work for 7.5 hrs,C and A work for 10 hrs .
i dont remember but ......its arrange in increasing order by their work