pipe A can fill a tank in 4 hours. pipe B can fill in 9 hours less then the time it takes pipe C, a drain pipe, to empty the tank. When all 3 pipes are open, it takes 2 hours to fill the tank. How much time is required for pipe C to empty the tank if pipes A and B are closed. CAN SOMEONE SHOW ME THE STEPS FOR IT?

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need help

Thank You very much. So what would be the final answer?

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