Daniel rollerbladed 3 miles in 12 minutes what was his speed in miles per hour

15mi per hr

60/12=5

3mi • 5 = 15

Daniel is rollerblading at 15 miles per hour

Daniel can go 3 miles in 12 minutes so we do 12:3 to find out how many minutes it takes to go 1 mile which is 4 now we do 60:4 to get 15

Alternatively we could do 60:12 to get 5 then do 3*5 to get 15