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Machine A can make 350 widgets in 1 hour, and machine B can make 250 widgets in 1 hour. If both machines work together, how much time will it take them to make a total of 1000 widgets?
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A.1 hour and 20 minutes
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B.1 hour and 24
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C.1 hour and 30 minutes
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D.1 hour and 30 minutes
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E.1 hour and 40 minutes
E显示答案
