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18-07-2017
Mathematics

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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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twvogels twvogels

18-07-2017

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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