To find out how many miles Martina would drive in 13 hours at the same rate, we first need to determine her driving rate in miles per hour.
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Calculate her driving rate: \[ \text{Rate} = \frac{\text{Total miles}}{\text{Total hours}} = \frac{638 \text{ miles}}{11 \text{ hours}} \approx 58 \text{ miles per hour} \]
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Next, we can use this rate to find out how far she would drive in 13 hours: \[ \text{Distance in 13 hours} = \text{Rate} \times \text{Time} = 58 \text{ miles per hour} \times 13 \text{ hours} \]
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Now, we calculate the distance: \[ 58 \times 13 = 754 \text{ miles} \]
Therefore, at the same rate, Martina would drive approximately 754 miles in 13 hours.