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 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 21 days

B 11 days

C 13 days

D None of these

Solution

Correct Answer: Option C