Threshold of Study Hours for Exam Score

Maria is examining the relationship between the number of hours she studies each week, denoted as $h$, and her score on a standardized exam, denoted as $s$. After conducting a survey, she finds that the score can be represented by the linear equation:

$$ s = 5h + 60 $$

Additionally, she notices a threshold below which it is not feasible to achieve a passing score of at least 80 on the exam. This threshold is defined by the inequality:

$$ s < 80 $$

If Maria studies for $h$ hours, what is the maximum number of hours she can study while still ensuring her exam score remains below 80?