To pump 1 ton of water, the time A uses is 3/4 of the time B uses

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To pump 1 ton of water, the time A uses is 3/4 of the time B uses. If A and B work together to pump 1 ton of water, they will use 6 hours. If B works by itself to finish the job, how much time will it use?

答案：14 hrs

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老师这题要怎么做啊

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