Question

It costs $25 to rent a kayak in addition to $7.50 per hour. Logan rented the kayak at 11:00 a.m. then returned it later that evening. If he paid $70, what time did he return the kayak?

Answer 1

70 = 25 + 7.50 h
45 = 7.5 h
h = six hours
11 to noon is one of the six hours, five are left so 5 pm

Answer 2

By the way, if you use a 24 hour (military or seagoing) clock, 11 + 6 = 17
17:00 is 5 pm