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8 September, 04:35

vincent's copier can print in 7 hours. chris's printer can do the same in 13 hours. how long would it take to do the job using both copiers

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  1. 8 September, 05:18
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    Step-by-step explanation:

    1/7+1/13=1/t

    multiply both sides by 7*13*t

    13t+7t=7*13

    21t=91

    t=91/19

    it will take 4 hours and 8 minutes
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