I understand this is a basic problem. For some reason I just can't wrap my head around it. Any help is appreciated. 1. The problem statement, all variables and given/known data Water flows through Pipe A five times faster than through Pipe B. When water flows through the both pipes a tank would be filled in 4 hours. How long will it take to fill a tank if only Pipe B opened? 2. Relevant equations 3. The attempt at a solution Pipe A: (5x) Pipe B: (x) Time: four hours.