Answer:
135 minutes.
Explanation:
To find the rate for 1 hour, you would divide 1.5 hours. by 6 miles. You would get .25. So a quarter of an hour is how long it takes for 1 mile. Now multiply .25 by 9. You should get 2.25 hours. .25= 1/4 so 2.25 is 2 hours and 15 minutes. There are 60 minutes in an hour and there are 2 hours. 2 times 60 plus 15. 135 minutes.
I hope this helps!