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?

Answer 1

The rental company charges $150 for the first 2 hours, so Delia has 6 - 2 = <<6-2=4>>4 additional hours.
Thus, the additional 4 hours of boat rental costs $250 total rental cost - $150 base rate = $<<250-150=100>>100.
Hence, each additional hour of boat rental costs $100 / 4 additional hours = $<<100/4=25>>25. Answer: \boxed{25}.