Answer: 4 hours
Explanation:
ok so for the first hour you'd pay 24, so subtract that from the total
60 - 24 = 36
and now to see how many hours you used it after the original hour, divide 36 by 12
36 รท 12 = 3
so you used it for three hours after the original hour
1 + 3 = 4
so you used it for 4 hours in total
hope this helps