Alex is planning a road trip. He creates a timeline to outline his journey: he will drive 200 miles in the first 3 hours, take a break for 1 hour, and then drive an additional 150 miles in the next 2 hours. What is Alex's average speed in miles per hour during the driving portion of his trip?
A) 50 mph
B) 60 mph
C) 70 mph
D) 80 mph