i am stuck on the following problem. here is a pic of the problem

http://imgur.com/CvLAT0P

any help would be appreciated

10/x-10/y=1

y =x+5

10/x-10/(x+5) =1

10(x+5)-10x =x(x+5)

10*5= x(x+5)

x^{2}+5x-50=0

x^{2}+10x-5x-50=0

x(x+10)-5(x+10)=0

(x+10)(x-5)=0

x=5 or x= -10

x= -10 not possible

x=5

Pipe A can fill in 5 hours.

Pipe B can drain in 10 hours if Pipe A is not open

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