"A is `30%` more efficient than B. How much time will they, working together, take to complete
Channel: Doubtnut
Date: 2020-07-05

"A is `30%` more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in `23` days?
 a. `11` days
 b. `13` days
 c. `20 3/17` days
 d. none of these"