Janna has driven 200 miles. If she averages 50 miles per hour, how many more hours must she drive before she has driven a total of 500 miles?
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Janna has to drive a total of 500 - 200 = 300 more miles.
At 50 miles per hour, she can drive 50 miles in 1 hour.
So to drive 300 miles, she needs to drive for 300 / 50 = 6 hours.
Therefore, Janna has to drive for 6 more hours. Answer: \boxed{6}.