Mathematics, 17.07.2019 17:30, Rixi1227

Herman and rosie need to wash the walls on the side of the school. herman has a power washer, which could complete the job in 10 hours. rosie has a manual scrubber, which could complete the job in 15 hours. if they work together, how many hours will it take them to clean the wall?

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Herman and rosie need to wash the walls on the side of the school. herman has a power washer, which...