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23-09-2017
Chemistry

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if one person can clean a house in 5 hours and the second person can clean the same house in 4 hours, how long would will it take to clean the house if they worked together?

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Аноним Аноним

23-09-2017

1/5 + 1/4 =1/x

4x + 5x = 20

9x = 20

x = 2.22 hours Answer

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