Question 1134010
in 1 hour, it is 1/4 full by Pipe A and in 1 hour 1/8 full by Pipe B.
in x hours, it is x/4 full by Pipe A and x/8 full by Pipe B.
in x hours, it is x/4 full by Pipe A and (x-1)/8 full by Pipe B and that sum equals 1, completely full.
multiply everything by 8, LCD.
2x+x-1=8
3x=9
x=3 hours
In 3 hours, it is 3/4 full by Pipe A and 2/8 or 1/4 full by Pipe B.  It is full.
11 am.