Question: Riding up an escalator while staying on the same step for the whole ride takes (30 mathrm{~s}). Walking up the same escalator takes (20 mathrm{~s}).

Riding up an escalator while staying on the same step for the whole ride takes $30 \mathrm{~s}$. Walking up the same escalator takes $20 \mathrm{~s}$. How long does it take to walk down the up escalator?

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