Mathematics, 25.09.2019 16:30 brittanycrowdis

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sally can paint a room in 7 hours and john can paint the same room in 10 hours. how long should it take sally and john to paint the room together?

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More questions: Mathematics Another questions

Idon't understand this ; -; sally can paint a room in 7 hours and john can paint the same room in 10 hours. how long should it take sally and john to paint the room together?

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Another question on Mathematics

Idon't understand this ; -;
sally can paint a room in 7 hours and john can paint the same room in 10 hours. how long should it take sally and john to paint the room together?