Solve the problem. A student plans to drive 100 miles on an undivided highway and another 150 miles on a divided highway. The speed limit for the undivided highway is 55 mph and the speed limit for the divided highway is 65 mph. Let T(a) represent the driving time (in hours) if the student drives at a mph above the speed limits. By finding a formula for T(a), determine by how much the student would need to drive over the speed limits for the trip to last 3.5 hours.
A. 9.2 mph
B. 8.1 mph
C. 13.5 mph
D. 10.8 mph
Answer: D
Mathematics
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