The correct answer is 'for each hour that Michelle drove, she traveled an additional 50 miles.'
Michelle drove for an hour and a half, covering an extra 50 kilometres.
This is merely an interpretation of a time-distance graph.
According to what is said, the graph demonstrates the relationship between the amount of hours she had been travelling and the remaining distance to her goal.
From the graph, we can observe that at 0 hours, she had 350 miles to cover.
It is true that Michelle drove for an extra 50 miles per hour because we can see that she still had 300 miles to go after one hour. She had 250 miles left after another hour. After another hour, she still had 200 miles to go. She travelled at a 50 mph average based on this pattern.
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