Pipe A can fill a tank in 8 hours, while pipe B can fill it in 12 hours working separately. Pipe C can empty whole the tank in 8 hours. He opened the pipe A and B simultaneously to fill the empty tank. He wanted to adjust his alarm so that he could open the pipe C when it was half-filled, but he mistakenly adjusted his alarm at a time when his tank would be 3/4th filled. What is the time difference between both the cases, to fill the tank fully :
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