"A is 50% as efficient as B.C does half of the work done by A and B togethe
Channel: Doubtnut
Date: 2020-04-05

"A is 50% as efficient as B.C does half of the work
 done by A and B together. If C alone does the work in 40 days, then A, B and
 C together can do the work in:
`13 1/3d a y s`
b. `15\ d a y s`
c. `20\ d a y s`
d. 30
 days"