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. 9 days
C. 13 days
D. 15 days
Answer:C
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. 9 days C. 13 days D. 15 days