SOLUTION: Pipes A and B can fill a tank in 45 minutes when used together. Alone, pipe A can fill the tank in one hour. How long would it take to fill the tank if only pipe B is used?

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Question 314317: Pipes A and B can fill a tank in 45 minutes when used together. Alone, pipe A can fill the tank in one hour. How long would it take to fill the tank if only pipe B is used?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/60+1/x=1/45
1/x=1/45-1/60
1/x=(60-45)/(45*60)
1/x=15/2,700 cross multiply.
15x=2,700
x=2,700/15
x=180 or 3 hours for pipe B to fill the tank alone.