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High speed copier works three times as fast as a regular copier.
When both copiers are used, they can copy a group of documents in 12 minutes.
How long would each copier require to do the copying alone

  • algebra -

    let T be the time for the reg copier to make one document, and T/3 the time for the HSpeed.

    task= rate*time=
    group= (group/T + 3group/T)*12

    1/12= 4/T

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