Sara and sam went for a two-hour drive. according to the graph, between .75 hours and 1.25 hours into their trip, they

I have attached a screenshot with the complete question.

were not moving since there was no change in position

Explanation:
In the given graph, we have the x-axis showing the time they walked and the y-axis showing the distance they moved.

In the interval between 0.75 hours and 1.25 hours, we can note that the distance is remaining constant at 30 km.

This means that during this interval, their distance did not change which implies that they were not walking.

Hope this helps :)