A man walks ata speed of \( 6 \mathrm{~km} / \mathrm{h} \) for \( 1 \mathrm{~km} \) and \( 8 \ma...

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A man walks ata speed of \( 6 \mathrm{~km} / \mathrm{h} \) for \( 1 \mathrm{~km} \) and \( 8 \mathrm{~km} / \mathrm{h} \) for next \( 1 \mathrm{~km} \). What is his average speed for a walk of \( 2 \mathrm{~km} \) ?
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