Pipe a can fill the tank in 4 hours, while pipe b can fill it in 6 hours working separately. Pipe c can empty whole the tank in 4 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 difference between both the cases, to fill the tank fully?
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you should ask to your math teacher
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