A and B together can do piece a work in 15 days. B and C together do it in 20 days. If A’s efficiency is twice that of C, Then the days required for B alone to finish the work is:-
1
30 days
2
121/4 days
3
123/7 days
4
90 days
A and B together can do piece a work in 15 days. B and C together do it in 20 days. If A’s efficiency is twice that of C, Then the days required for B alone to finish the work is:-