Two persons do the same amount of work in \( 10 \mathrm{~s} \) and \( 20 \mathrm{~s} \), respect...

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Two persons do the same amount of work in \( 10 \mathrm{~s} \) and \( 20 \mathrm{~s} \), respectively. What is the ratio of the power used by the first person to that by the second person?
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