Question 271958
A Can do a job in 9 days, A and B together can complete a job in 5 days. How long will B Alone can complete it? 

--------
A rate: 1/9 job/day
Together rate: 1/5 job/day
B rate = 1/x job/day
-----
Equation:
rate + rate = together rate
1/9 + 1/x = 1/5
1/x = 1/5 - 1/9
1/x = 4/45
x = 45/4
x = 11 1/4 days (Time for B to do the job alone)
=========================================================
Cheers,
Stan H.