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9 September, 15:35

A dishwasher can wash 14 plates per minute. Another dishwasher can wash 10 plates per minute. How many minutes will the two working together need to wash 1,560 plates?

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  1. 9 September, 16:00
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    The dishwashers can wash 14p/mn+10p/mn=24plates / mn

    so

    1mn ... > 24 plates

    X=? < ... 1,560 plates

    so X = 1560/24 = 65 minutes
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