First, we need to find Grace's running speed. She ran a marathon of 26 miles in 4 hours.
To find her speed in miles per hour (mph), we divide the total distance by the total time:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{26 \text{ miles}}{4 \text{ hours}} = 6.5 \text{ mph} \]
Now we can calculate how far Grace would run in 1.5 hours using her speed:
\[ \text{Distance} = \text{Speed} \times \text{Time} = 6.5 \text{ mph} \times 1.5 \text{ hours} = 9.75 \text{ miles} \]
Therefore, Grace ran 9.75 miles in 1.5 hours.
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