SOLUTION: 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?

Question 770912: 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?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = B's rate of working
= A's rate of working
---------------
Also given is:
A's rate of working is ( 1 job ) / ( 23 days )

and

----------------
Let = time in days to finish
job working together

Multiply both sides by

Working together, they can do the
job in 13 days
check:

OK
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