06-12-2017
Mathematics

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To complete a job, it takes: 2 hours for Alice and bob, 3 hours for Alice and Charlie and 4 hours for bob and Charlie. How long will the job take if all three work together?

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kelsey4215 kelsey4215

06-12-2017

Should be 3 hours I’m thinking because you find the average (adding all the hours together and dividing by 3).

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