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07-06-2018
Mathematics

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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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Аноним Аноним

07-06-2018

It would take them 6 hours. Six hours is 3/5 of Herman’s required time. 6 hours is 2/3 of Rosie’s, so 3/5 +2/5= the project being complete.

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