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Let's first calculate the relative speed between Dorabella and Guillermo.
Since they are traveling in the same direction, the relative speed would be the difference in their speeds:
Relative speed = 9 mph - 7 mph = 2 mph
Now, we can calculate the time it takes for Guillermo to catch Dorabella using the formula:
Time = Distance / Relative speed
Distance = 4 miles (as Dorabella is 4 miles ahead)
Relative speed = 2 mph
Time = 4 miles / 2 mph = 2 hours
Therefore, it will take Guillermo 2 hours to catch Dorabella.