Mathematics

17 July, 19:56

Following a Severe snowstorm, ken and Bettina reeves must clear their driveway and side walk. Ken can clear the snow by himself in 3 hours, and Bettina can clear the snow by herself in 6 hours. After Bettina has been working for 1 hour, 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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