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Donna drives from Baltimore to Miami. The total time, in hours, of Donna's trip depends on her speed, in miles per hour. This relationship is shown in the graph below.

Approximately, how much longer does the trip take if Donna drives 55 miles per hour than if she drives 70 miles per hour?
 
Fake Radio Button   A     2 hours
Fake Radio Button   B     6 hours
Fake Radio Button   C     15 hours
Fake Radio Button   D     21 hours
 
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