To find out how far Grace ran in 1.5 hours, first, we need to determine her average speed during the marathon.
The marathon distance is 26 miles, and it took her 4 hours to complete it.
Average speed = Total distance / Total time Average speed = 26 miles / 4 hours = 6.5 miles per hour.
Now, we can find out how far she ran in 1.5 hours:
Distance = Speed × Time Distance = 6.5 miles per hour × 1.5 hours = 9.75 miles.
So, the correct response is 9.75 miles.