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Mathematics, 27.03.2020 19:50 Areyano7236

Barney can build a tree house in 15 hours. Working with David, they can build the
same tree house in 10 hours. How long does it take David to build the tree house if
he works alone?

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Barney can build a tree house in 15 hours. Working with David, they can build the
same tree ho...

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