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A tank can be filled by Pipe A in 4 hours and by Pipe B in 6 hours. How long will it take to fill the tank if both pipes are opened together?
Solving the quadratic using the quadratic formula:
Correct approach: use formula and accept non-integer, but must be integer.
But problem must have integer solution—recheck setup.
But 220 is close to 210, so problem may have typo?
However, for math olympiad, perhaps accept exact solution.