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Mr. K was able to spot quite a few window washers on the skyscrapers there. He asked them how long it took to wash windows

Mr. K was able to spot quite a few window washers on the skyscrapers there. He asked them how long it took to wash windows on such a building. They said that each person could wash 50 windows in 1 hour. How long would it take the 3 workers to wash all 1000 windows on one of the skyscrapers?

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