To determine how many miles Merrida traveled each hour, we can calculate the speed for each of the hours given in the table.
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For 4 hours and 140 miles: \[ \text{Speed} = \frac{140 \text{ miles}}{4 \text{ hours}} = 35 \text{ miles per hour} \]
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For 5 hours and 175 miles: \[ \text{Speed} = \frac{175 \text{ miles}}{5 \text{ hours}} = 35 \text{ miles per hour} \]
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For 6 hours and 210 miles: \[ \text{Speed} = \frac{210 \text{ miles}}{6 \text{ hours}} = 35 \text{ miles per hour} \]
In each case, the speed is consistently 35 miles per hour. Therefore, the answer is:
35 miles per hour