Answer:
distance = 80 miles
Explanation:
The rate is distance over time
rate = 15 miles/ 90 minutes
Converting the minutes to hours
90 minutes * 1 hours / 60 minutes = 1.5 hours
rate = 15 miles / 1.5 hours = 10 miles/ hour
We know distance rate * time
She rides 8 hours per week
distance = 10 miles / hour * 8 hours
distance = 80 miles