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9 November, 21:35

Eric kweeder can paint a wall in 20 mins. His brother Jessup can paint the same wall in 30 mins. How long will it take them working together?

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  1. 9 November, 21:54
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    We=1/20

    Wj=1/30

    Wt = 1/20+1/30 = 30/600 + 20/600 = 50/600 = 1/12

    T = 1/rate = 1 / (1/12) = 12 minutes.
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