At a local coffee shop, the cost to rent a meeting room is modeled by the linear equation:

$$ C = 75 + 15h $$

where:

• $$ C $$ is the total cost in dollars
• $$ h $$ is the number of hours the meeting room is rented

If a customer spent a total of $255 to rent the meeting room, how many hours did they rent it for? Calculate and enter your answer as a decimal or fraction.