Question: You are going to visit your grandparents, who live (500 mathrm{~km}) away. As you drive on the freeway, your speed is a constant (100 mathrm{~km}

You are going to visit your grandparents, who live $500 \mathrm{~km}$ away. As you drive on the freeway, your speed is a constant $100 \mathrm{~km} / \mathrm{h}$. Half an hour after you leave home, your brother discovers that you forgot your wallet. He jumps into his car and speeds after you. The two of you arrive at your grandparents' house at the same instant. What is your brother's average speed for the trip?

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