Question: A (68 mathrm{~kg}) runner runs a marathon ((42.2 mathrm{~km})) at a pace of (15 mathrm{~km} / mathrm{h}). To expend the same number of Calories as

A $68 \mathrm{~kg}$ runner runs a marathon $(42.2 \mathrm{~km})$ at a pace of $15 \mathrm{~km} / \mathrm{h}$. To expend the same number of Calories as she did in running this race, how many $2.7-\mathrm{m}$-high flights of stairs would she need to climb?

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