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20 December, 01:56

There are 720 dishes that need to be rinsed. Scott can rinse them in 72 minutes by himself. It will take his friend D 90 minutes to rinse these dishes. How long will it take them if they rinse these 720 dishes together

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  1. 20 December, 02:49
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    10plates/min scott

    8plates/min D

    18plates/min together

    720/18 = 40min
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