You go for a half day hike. in 4 hours, you hike 10 miles. which is a unit rate that describes your journey?
a- 5 miles per hour
b- 2.5 miles per hour
c- 4/10 (< --fraction) miles per hour
d- 10 miles per hour < mum thinks this is 'answer' > ,<

B-2.5mph You divide 10 (how far you went) by 4 (the amount of time it took you) which gives you 2.5 (the amount of time it takes you to walk 1 mile) To check: It takes you 2.5 hours to walk 1 mile so multipling 2.5 by 4 tells you how far you walked in 4 hours

The answer would be B) 2.5 miles per hour.
Number of miles travelled in an hour = 10/4 =2.5
Sorry to say but I am pretty sure D) isn't the answer.