Question: You normally drive a 12 -h trip at an average speed of (100 mathrm{~km} / mathrm{h}). Today you are in a hurry. During the first

You normally drive a 12 -h trip at an average speed of $100 \mathrm{~km} / \mathrm{h}$. Today you are in a hurry. During the first two-thirds of the distance, you drive at $108 \mathrm{~km} / \mathrm{h}$. If the trip still takes $12 \mathrm{~h}$, what is your average speed in the last third of the distance?

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