Delia spent $250 to rent a boat for 6 hours. The rental company charges a base rate of $150 for the first two 2 hours, and then an hourly rate for each additional hour. How much does each additional hour of boat rental cost?(

1 answer

The rental company charges $150 for the first 2 hours, so that leaves $250 - $150 = $<<250-150=100>>100 for the remaining 4 hours.
Delia is being charged $100 for 4 hours, so each additional hour costs $100 / 4 hours = $<<100/4=25>>25/hour. Answer: \boxed{25}.