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Answer

Option B is correct.

Walking rate = 2 (2/3) miles per hour.

Explanation

To answer this, we need to first note that

1 hour = 60 minutes

So, we have

[tex]\begin{gathered} \frac{\frac{2}{3}\text{mile}}{15\text{ minutes}}\times\frac{60\text{ minutes}}{1\text{ hour}} \\ =\frac{2}{3}\times4 \\ =\frac{8}{3} \\ =2\frac{2}{3}\text{ miles per hour} \end{gathered}[/tex]

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