Mathematics, 15.04.2020 00:33 maysahdabest

Following a severe snowstorm, Ken and Bettina Reeves must clear their driveway and sidewalk. Ken can clear the snow by himself in 3 hours, and Bettina can clear the snow by herself in 4 hours. After Bettina has been working for 2 hours comma Ken is able to join her. How much longer will it take them working together to remove the rest of the snow?

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