Mathematics, 28.07.2020 23:01, mpgleboski

Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a 20-foot chimney in 1Five-sevenths hours. If it takes Kalon 4 hours to clean a 20-foot chimney by himself, how long does it take Marna to clean the same size chimney by herself?

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Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a 2...