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working by herself it takes molly 4 hours to shovel jim's driveway and sidewalk. It takes Jim 6 hours to shovel his driveway and sidewalk

working by herself it takes molly 4 hours to shovel jim's driveway and sidewalk. It takes Jim 6 hours to shovel his driveway and sidewalk by himself. How long would it take molly and jim to shovel jim's driveway and sidewalk if they worked together

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