Question: Two pipes can be used to fill a pool. Working together two pipes can fill the pool in 4 hours. The larger pipe can fill

Two pipes can be used to fill a pool. Working together two pipes can fill the pool in 4 hours. The larger pipe can fill the pool in 3 hours less than the smaller pipe can alone. Find the time to the nearest tenth of an hour it takes for the smaller pipe working alone to fill the pool. The answer is 9.8 hours. How did they get that answer?

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