Answer:
c. 80 minutes
Explanation:
Some problems give you too much information, and you need to choose only the information you need. The number of pages is not important. Here you only need the time, 4 hours, and the number of assignments, 3.
4 hours × 60 minutes / hour = 240 minutes
240 minutes / 3 assignments = 80 minutes/assignment
Answer: c. 80 minutes