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Mathematics 11 Online
OpenStudy (anonymous):

Following a severe snow storm, Ken and Bettina Reeves must clear the driveway and sidewalk. Ken can clear the snow by himself in 2 hours and Bettina can clear the snow by herself in 5 hours. After Bettina has worked for one hour Ken can join her. How long will it take for both of them to clear the snow?

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