Will this work?
30mi = 1hr = 60min
30mi = 60min
Flip it around
How long would it take to go 1 mile - explain that you have to divide 30mi by 30 to get 1 mi, but you have to do the same to the minutes.
30mi/30 = 1 mi 60min/30 = 2 min
(my 3rd grader seemed to do well when the answer wasn't a fraction)
So, 1mi = 2 min
Than explain that to get to 1 minute you have to cut 2 minutes in half, but you have to do the same to same to the distance.
Put it all together and you get
