Answer:
18mph
Step-by-step explanation:
60/15 = 4
4 x 4.5 = 18
since 15 minutes is only a quarter of an hour, if you multiply it by 4 you get an hour. therefore multiplying 4.5 by 4 will give you the ammount of miles that would be traveled in an hour since that is also a quarter of the miles traveled per hour.
