John travels 150 miles in 2 hours. The speed limit is 60 mph. How many mph above the speed limit was he driving? Let's be accurate as possible.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
He was driving 150 / 2 = 75 mph. So he was 75 - 60 = 15 mph above the speed limit.
The answer: 15.