Maria can rent the boat for 4 hours
Step-by-step explanation:
Given:
Rental cost per hour = $60
Safety course cost = $10
Total rental cost = $60 + $10
= $70
Total amount to be spent = $280
Number of hours, n = ?
According to the question,
60n + 10 <= 280
60n <= 280 - 10
60n <= 270
n <= 4.5
However for whole number of hours, n = 4
Therefore, Maria can rent the boat for 4 hours