I'll finish this in a comment or get a mod to open it, but the way it reads, it beeps 67.2 times in those 12 hours. Did you mean per hour?
67.2 / 12 = 5.6
See comment below. The question is the number of beeps in 1 hour which is 5.6 <<<< Answer
Answer:
7:15
Step-by-step explanation:
There are 15 students total, and 7 of them are going on the trip. Therefore, we write that as 7:15