Question 900492
A takes 8 hours for 1 tank
B takes 5 hours for 1 tank
That means it takes them 13 hours to fill 2 tanks together.
Divide by 2 to get 1 tank average.
13/ 2 = 6.5
Now divide by 2 again since they are filling it together.
6.5/2 = 3.25 hours